3. Are human activities causing climate change?
Human activities have increased greenhouse gas concentrations in the atmosphere
Atmospheric concentrations of carbon dioxide (CO2), methane and nitrous oxide began to rise around two hundred years ago, after changing little since the end of the last ice age thousands of years earlier. The concentration of CO2 has increased from 280 parts per million (ppm) before 1800, to 396 ppm in 2013. This history of greenhouse gas concentrations has been established by a combination of modern measurements and analysis of ancient air bubbles in polar ice (Box 2.1).
Particularly important is CO2. Enormous amounts of it are continually exchanged between the atmosphere, land and oceans, as land and marine plants grow, die and decay, and as carbon-rich waters circulate in the ocean. For several thousand years until around 200 years ago, this ‘carbon cycle’ was approximately in balance and steady. Since the 19th century, human-induced CO2 emissions from fossil fuel combustion, cement manufacture and deforestation have disturbed the balance, adding CO2 to the atmosphere faster than it can be taken up by the land biosphere and the oceans (Figures 3.1 and 3.2). On average over the last 50 years, about 25% of total CO2 emissions were absorbed by the ocean making sea water more acidic and 30% was taken up on land, largely by increased plant growth stimulated by rising atmospheric CO2, increased nutrient availability, and responses to warming and rainfall changes (though the mix of these mechanisms remains unclear). The other 45% of emissions accumulated in the atmosphere. These changes to the carbon cycle are known from measurements in the atmosphere, on land and in the ocean, and from modelling studies.
The dominant cause of the increasing concentration of CO2 in the atmosphere is the burning of fossil fuels. Over the last two centuries, the growth of fossilfuel combustion has been closely coupled to global growth in energy use and economic activity. Fossilfuel emissions grew by 3.2% per year from 2000 to 2010 (Figure 3.3), a rapid growth that is dominated by growth in Asian emissions and has exceeded all but the highest recent long-range scenarios for future emissions.
Although fossil-fuel emissions of CO2 have grown fairly steadily, the upward march of the CO2 concentration in the atmosphere varies from year to year. This is caused mainly by the effects of weather variability on vegetation, and also by sporadic volcanic activity: major volcanic eruptions have a significant indirect influence on atmospheric CO2 concentrations, causing temporary drawdown of CO2 through the promotion of plant growth by the light-scattering and cooling effects of volcanic haze. By contrast, the direct contribution of volcanic emissions to atmospheric CO2 is negligible, amounting to around 1% of current humaninduced emissions.
Most of the observed recent global warming results from human activities
Climatic warming or cooling arises from changes in the flows of energy through the climate system (Figure 1.1) that can originate from a number of possible driving factors. The main drivers that have acted over the last century are:
- increases in atmospheric CO2 and other long-lived greenhouse gases (methane, nitrous oxide and halocarbons)
- increases in short-lived greenhouse gases (mainly ozone)
- changes to land cover (replacement of darker forests with paler croplands and grasslands)
- increases in aerosols (tiny particles in the atmosphere)
- solar fluctuations (changes in the brightness of the sun)
- volcanic eruptions.
Of these, solar fluctuations and volcanic eruptions are entirely natural, while the other four are predominantly caused by human influences. The human-induced drivers have been dominant over the past century (Figure 3.4). Changes in greenhouse gas concentrations, dominated by CO2, caused a large warming contribution. Some of this has been offset by the net cooling effects of increased aerosol concentrations and their impact on clouds. Black carbon or soot has probably exerted a smaller, warming influence. The net effect of all aerosol types including soot remains hard to quantify accurately. Among the natural influences, the effect of changes in the brightness of the Sun has been very small (Box 3.1). Volcanic influences are highly intermittent, with major eruptions (such as Pinatubo in 1991) causing significant cooling for a year or two, but their average effects over the past century have been relatively small.
Box 3.1: Do changes in the Sun contribute to global warming?
In comparison with other influences, the effects of solar variations on present global warming are small. Indirect estimates suggest that changes in the brightness of the Sun have contributed only a few percent of the global warming since 1750. Direct measurements show a decreasing solar intensity over recent decades, opposite to what would be required to explain the observed warming. Solar activity has declined significantly over the last few years, and some estimates suggest that weak activity will continue for another few decades, in contrast with strong activity through the 20th century. Nevertheless, the possible effects on warming are modest compared with anthropogenic influences.
Using climate models, it is possible to separate the effects of the natural and human-induced influences on climate. Models can successfully reproduce the observed warming over the last 150 years when both natural and human influences are included, but not when natural influences act alone (Figure 3.5). This is both an important test of the climate models against observations and also a demonstration that recent observed global warming results largely from human rather than natural influences on climate.
It is also possible to distinguish the effects of different human and natural influences on climate by studying particular characteristics of their effects. For example, it was predicted more than a century ago that increases in CO2 would trap more heat near the surface and also make the stratosphere colder. In recent years, satellite and other measurements have provided strong evidence that the upper atmosphere has cooled and the lower atmosphere has warmed significantly—the predicted consequence of extra greenhouse gases. This supports the inference that the observed nearsurface warming is due primarily to an enhanced greenhouse effect rather than, say, an increase in the brightness of the Sun.
Some recent changes in Australia’s climate are linked to rising greenhouse gases
Modelling studies indicate that rising greenhouse gases have made a clear contribution to the recent observed warming across Australia. Depletion of the ozone layer in the upper atmosphere over Antarctica and rising greenhouse gas concentrations are also likely to have contributed significantly to climate trends that have been observed in the Australian region over the past two decades. These include stronger westerly winds over the Southern Ocean, strengthening of the high-pressure ridge over southern Australia, and a related southward shift of weather systems. These trends are consistent with climate model projections, and are likely to be largely human-induced through a combination of increases in greenhouse gases and thinning of the ozone layer.
Past decadal trends in Australian rainfall (Question 2) cannot yet be clearly separated from natural climate variations, except in southwest Western Australia where a significant observed decline in rainfall has been attributed to human influences on the climate system.
There has very likely been net uptake of CO2 by Australian vegetation, consistent with global uptake of CO2 by vegetation on land (Figure 3.2). This has been accompanied by increases in the greenness of Australian vegetation, which is also consistent with global trends.
What I Learned about Climate Change: The Science is not Settled
- David Siegel
THIS ESSAY has had over 180,000 views. Please link to ClimateCurious.com. Welcome new readers from my Interview with Barack Obama. Enjoy!
What is your position on the climate-change debate? What would it take to change your mind?
If the answer is It would take a ton of evidence to change my mind, because my understanding is that the science is settled, and we need to get going on this important issue, that’s what I thought, too. This is my story.
More than thirty years ago, I became vegan because I believed it was healthier (it’s not), and I’ve stayed vegan because I believe it’s better for the environment (it is). I haven’t owned a car in ten years. I love animals; I’ll gladly fly halfway around the world to take photos of them in their natural habitats. I’m a Democrat: I think governments play a key role in helping preserve our environment for the future in the most cost-effective way possible. Over the years, I built a set of assumptions: that Al Gore was right about global warming, that he was the David going up against the industrial Goliath. In 1993, I even wrote a book about it.
Recently, a friend challenged those assumptions. At first, I was annoyed, because I thought the science really was settled. As I started to look at the data and read about climate science, I was surprised, then shocked. As I learned more, I changed my mind. I now think there probably is no climate crisis and that the focus on CO2 takes funding and attention from critical environmental problems. I’ll start by making ten short statements that should challenge your assumptions and then back them up with an essay.
1Weather is not climate. There are no studies showing a conclusive link between global warming and increased frequency or intensity of storms, droughts, floods, cold or heat waves. The increase in storms is simply a result of improved measurement methods. There has been no real increase.
2Natural variation in weather and climate is tremendous. Most of what people call “global warming” is natural, not man-made. The earth is warming, but not quickly, not much, and not lately.
3There is tremendous uncertainty as to how the climate really works. Climate models are not yet skillful; predictions are unresolved.
4New research shows fluctuations in energy from the sun correlate very strongly with changes in earth’s temperature, better than CO2 levels.
5CO2 has very little to do with it. All the decarbonization we can do isn’t going to change the climate much.
6There is no such thing as “carbon pollution.” Carbon dioxide is coming out of your nose right now; it is not a poisonous gas. CO2 concentrations in previous eras have been many times higher than they are today.
7Sea level will probably continue to rise — not quickly, and not much. Researchers have found no link between CO2 and sea level.
8The Arctic experiences natural variation as well, with some years warmer earlier than others. Polar bear numbers are up, not down. They have more to do with hunting permits than CO2*.
9No one has demonstrated any unnatural damage to reef or marine systems. Additional man-made CO2 will not likely harm oceans, reef systems, or marine life. Fish are mostly threatened by people, who eat them. Reefs are more threatened by sunscreen than by CO2.
10The Intergovernmental Panel on Climate Change and others are pursuing a political agenda and a PR campaign, not scientific inquiry. There’s a tremendous amount of trickery going on under the surface*.
Could this possibly be right? Is it heresy, or critical thinking — or both? If I’ve upset or confused you, let me guide you through my journey.
I won’t present all the science. Instead, my goal is to give you a platform for investigating the other side of the debate, so you can form your own opinion. I have noted important and quick reads with an asterisk* — if you have time for further study, start with those videos and documents. Here are the sections:
- Critical Thinking
- Four Hard Questions
- The Climate Consensus
- Manufacturing Consensus
- Who Can We Believe?
- What Should We Do?
- What Do You Think?
This nine-thousand-word essay represents over 400 hours of research boiled down into a half-hour reading experience, with links to 250+ carefully chosen documents and videos. I’m building the argument from the bottom up, so take your time and see if it makes sense. Along the way, I’ll list five “smoking guns” that I think make the argument for decarbonization unsupportable. Before we dive in, I want to talk about …
M y journey into critical thinking has taught me to hold strong opinions loosely. I’ve been more wrong in my life than I thought was possible. Now I try to put my reactions aside and look at all the evidence before coming to a conclusion.
Policy always involves politics. Governments often make policy decisions by starting with a social objective and then bring in the “facts” to justify the goal (think of the Vietnam war, the Iraq war, Prohibition, the War on Drugs, and others). We shouldn’t be surprised to find social agendas driving at least some of the “science” of global warming.
In addition, studies show that political beliefs cloud our ability to process information. Strong political beliefs can cause us to look at one side of an issue and ignore the evidence. We should try to avoid shortcuts and look directly at the data.
Forecasts are mental constructs; they are not properties of the physical world. Forecasts are tools, not truth. In most cases, the size of the error bars (uncertainty) around the number is more important than the number itself.
Consensus is not an argument for any scientific principle. Many important scientists toiled alone to make discoveries that were less than popular. One key paper can be worth more than thousands of papers reinforcing a myth. The claim that 97 percent of scientists believe in man-made global warming is one such myth. Almost all scientists expect a small man-made contribution to warming, so the claim is misleading.
Metastudies are important. One key paper can be a breakthrough, but there are very few of those. A better source of information is properly done metastudies (reviews of all the literature on a topic) conducted by qualified statisticians. They help find the signal in the noise.
There is a big climate conference coming up in Paris in December, 2015. Diplomats will debate the merits of an agreement that promises to steer hundreds of billions of dollars toward reducing carbon emissions, mostly in large developing countries. Is it based on sound science? Let’s ask four hard questions and see what we can learn …
- What are the natural drivers of temperature and its variability?
- What does the projected natural increase in temperature mean for the environment and people?
- What does the increase in greenhouse gases from human activity mean for oceans, environment, animals, habitats, and humanity?
- Is Decarbonation the Right Solution?
Let’s look with fresh eyes and see what we can learn.
1. What are the natural drivers of temperature and its variability?
Incoming solar radiation is the primary driver of temperature. A second factor is the atmosphere, which traps heat and reflects some of it back to earth. Other factors play smaller roles. I’ll start with the familiar greenhouse-gas model and then present a more accurate picture based on solar activity.
The Greenhouse Effect
In this section, I focus on CO2 because it’s regarded as the main greenhouse gas after water vapor. Looking at the 750-million-year graph below, we see some extreme cold periods, then warm epochs punctuated by ice ages, all while CO2 (yellow) was far above what it is today. There is almost no correlation between temperature and carbon dioxide until about ten million years ago.
Starting around a million years ago, the curves start to sync up, and we see a pretty definitive supercycle of about 100,000 years for both:
Think about that: CO2 had no correlation with temperature for more than 2 billion years, and now it’s causing temperature to rise? Something’s going on, but what? Let’s zoom in:
Notice that temperature generally changes first, and CO2 changes some 800+ years later. Blue line to the left, red line to the right. This is called the temperature lag — an inconvenient truth for CO2-warming enthusiasts; it’s well known but not well understood. It could easily be a complex relationship, but CO2 changes do not initially cause historical temperature changes.
On a shorter time scale, we start to get some perspective:
At this scale of 11,000 years, it doesn’t seem like CO2 is “driving” temperature. We are in the middle of an upswing coming out of the Little Ice Age, but there is also an overall cooling trend.
Before the twentieth century, there was plenty of temperature variability, and it continues today. If you have heard about the hockey-stick controversy, it’s about whether this graph created by Michael Mann, which Al Gore likes to stand in front of on a scissor lift, represents reality:
It doesn’t. Despite what you read on Wikipedia, this graph was manufactured by carefully cherrypicking the data from tree rings. Looking at tree rings is about the least accurate way to measure ancient temperatures. Better methods involve looking at drilled ice and sediment cores. Using those methods, we see a pronounced period warmer than today from 1000 to 1300 AD, called the Medieval Warm Period, and then the Little Ice Age about 400 years ago (same time period as above):
This single issue invalidates many of Al Gore’s claims* and undermines the IPCC’s predictions of man-made CO2 catastrophe. (You’ll find a list of relevant studies at CO2Science.org*.)
Smoking gun #1: The Hockey Stick is Wrong; The Medieval warming period was real and worldwide.
Once I understood that the IPCC was playing games, I realized I had a lot of work to do to uncover the rest of the story. It starts with data manipulation.
Where Does the Data Come From?
For the last 80 years, we have far more accurate ways of recording temperature, so the far right hand side of the graph above should come from direct measurements. Weather stations that gather this data differ in quality and consistency, especially over decades as the areas around them develop. A large-scale reassessment of all US weather stations from 1979 to 2008 carefully divided the stations into five classes, from best quality (I) to worst (V). For this period of time, they calculated the per-decade average temperature increases, and found:
- Class I and II only (most accurate): 0.155 C
- Class III, IV, and V sites only: 0.248 C
- NOAA 2015 “adjusted” calculation: 0.309 C
What does that tell you? NOAA is “adjusting” their data to increase warming figures far out of the realm of possibility. The IPCC relies mostly on NOAA data and other similarly adjusted data, which conveniently provides an instant doubling of temperature increase, making all the graphs much steeper after 1980.
The science is extremely complex and uncertain. If you have blind faith in the wrong numbers, you’re going to jump to the wrong conclusions.Anthony Watts has carefully reviewed NOAA’s data and found unscientific manipulation. Watch this 15-minute video* and decide for yourself*:
NOAA continues to “adjust” their data, manufacturing graphs that support the cause.
Smoking gun #2: Government agencies have rigged climate data to support man-made global warming.
Note: It’s easy to find nonscientific articles and videos that “prove” the hockey stick has been validated by updated research and that the sun’s energy doesn’t fluctuate. However, one central tenet of journalism is that you can’t fact-check a source by asking the source, and that’s exactly what most journalists are doing. To fact-check the IPCC, look at the peer-reviewed literature written by scientists who are not in the IPCC.
That’s the greenhouse-gas theory. Now on to more recent research.
Many solar variables contribute to the variance we see in temperature: distance, orbit cycles, axis tilt, magnetic fields, sunspots, solar wind, cosmic rays, the passage of earth through our galaxy, etc. Even though the total energy coming from the Sun is nearly constant, a) those tiny fluctuations can make a difference, and b) there are many other factors that can and do change. In particular, magnetic field changes can have significant influence on the shape of the jet stream, and that can influence cloud formation.
Willie Soon, a solar physicist, showed that the tiny variations in incoming solar radiation can have a more direct effect on temperature than CO2 does, but it takes very sensitive measurements and careful analysis to see the signal. Willie and his team first did many months of inspecting data from weather stations in the Northern Hemisphere*, throwing out spurious and made-up measurements, to put an accurate temperature picture together (blue line):
Then they plotted total solar irradiation (TSI) and found a very good first-order correlation, much better than with CO2. The graph above is probably the most accurate picture we have for that time period. Below is a similar exercise for the United States:
Note that this graph accurately shows the most recent cooling trend since 1998 without any hand waving.
Smoking gun #3: Solar fluctuations correlate better with observed temperature fluctuations.
Not only do fluctuations in solar energy drive changes in climate, the oceans react to increases in solar energy by generating clouds that help regulate temperature. Since 2013, much research has been aimed at constructing a more accurate picture of past temperature/solar radiation correlation and developing a realistic solar-driven climate prediction model*, taking the greenhouse effect into account.
Sunspots fluctuate in roughly 11-year cycles. It’s complicated, but in general these cycles show a moderate amount of correlation with temperature. The period of no sunspot activity 400 years ago corresponds to the Little Ice Age, when winters were significantly colder than they are today.
The current cycle peaked in 2014. Solar experts speculate that the next cycle, which starts in 2020, will have fewer sunspots. If that turns out to be true, temperatures could be heading down, rather than up. Reactions to this cooling prediction range from “unlikely,” to “plausible,” to “probable.” Whatever mechanism causes sunspots could be part of the picture, but there are several different solar cycles, different research approaches, and competing theories. They are converging, but it’s a complex work in progress. A single predictive model is still years or decades away.
Hottest Year on Record?
When you hear claims of this year being “the hottest year on record,” you should understand that 1922, 1998, and 2010 were also extremely hot, and the El Niños were extreme then as well. That’s not a trend; that’s a local peak. Look at the last 18 years from satellite data:
How many peaks do you see that are higher than this year’s? Now look at the scale — it’s one degree Celsius from top to bottom. To give you a sense of how up and down this really is, I traced the graph above and put it in perspective of the 20 degrees C (36 degrees F) we might experience in a single day:
Same data, different perspective. Can you see the hottest year on record now? In any given year, several weather stations will record dramatic “all time highs” with no effect on global temperatures.
No one knows what will really happen. We can’t see the future. We know CO2 is increasing relentlessly, yet temperatures are not. If you believe in the IPCC models, then you need worldwide temperatures to start going up, and soon. A few more hurricanes wouldn’t hurt, either. If you agree that solar activity primarily drives climate changes, then you will probably agree with the current scientific consensus outside the IPCC and with the conclusions of a recent metastudy on temperature forecasts: one degree C of warming this century, plus or minus one degree. That’s the 90%-confidence prediction at this point, but there’s always a chance that they are wrong, or that things will change unexpectedly. We’ll know a lot more in another twenty years or so.
2. What does the projected natural increase in temperature mean for the environment and people?
Sea level won’t likely rise in response to increased CO2. For starters, sea level rises and falls more than people think. Global mean sea level rose about 15 cm (6 inches) in the twentieth century. The IPCC models predicted higher levels by now, but researchers have found no link between CO2 and sea level. Sea level rises linearly; the rate of rise is not increasing. Any rise so far is very much in line with natural factors, not man-made. Estimates range from 5-20 cm (2–8 inches) of sea level rise (naturally) by the end of this century.
Reef systems and marine life will not likely be harmed by additional CO2. Researchers use tank experiments and computer models to predict doom and gloom (this approach is full of errors). Despite what you read in the press, no one has yet seen any verifiable signs of manmade CO2 effects, or even pollution. Coral bleaching is a natural phenomenon caused by temperature changes, especially in El Niño and La Niña years — it’s been going on forever.Live reef experiments have shown that coral polyps adapt well to changes in pH, but sunscreen is toxic. Furthermore, a recent metastudy found no evidence of harm due to “ocean acidification” and no likely harm in the future. If you care about ocean life, stop eating it! Stop developers from replacing estuaries, wetlands, and mangrove swamps with condos. And please stop eating shrimp immediately.
Freak storms are a far bigger threat. Again, storms are not caused by global warming. Over the next hundred years, as our population reaches nine billion or so, we should expect extreme events to have catastrophic consequences around the globe as a result of massive-scale urbanization and natural variance . Damage figures will rise significantly as we build larger cities on the coasts and expensive buildings with sea views. Don’t be fooled by graphs showing rising damage figures — they are guaranteed! The science is settled on this — even the IPCC admits that none of it is driven by CO2.
Let’s talk about polar bears. The health and numbers of the Arctic’s 19 polar bear populations are in very good shape, better than in decades*. Mitch Taylor, who has studied polar bears for over 30 years, says populations are increasing and very resilient. Each year at least 600 polar bears are shot, killed, and eaten by hunters — did your favorite news source tell you that? Arctic sea ice grows and shrinks by an area almost the size of the continental United States every six months. As the planet gently warms, the overall trend for slightly less ice each year continues; all the animals who live there have been dealing with this kind of fluctuation for millions of years. International fishing and seal hunting quotas have more to do with polar bear numbers than temperature does.
Furthermore, Greenland is not melting into the sea because of global warming. Greenland’s temperature fluctuates all by itself and always has.
Far from the land of polar bears, we hear tales of extreme temperatures melting Antarctic ice sheets the size of Wyoming. Despite the fact that glaciers fall into the ocean dramatically each year, Antarctica’s ice is actually increasing (reason: it snows in Antarctica, but snowfall doesn’t make good news footage). Imagine a time-lapse movie of Antarctica over the past million years or more: we see huge amounts of ice accumulating, moving, dropping into the sea, over and over. We shouldn’t be surprised to watch the Larsen B ice shelf fall into the sea — it should take extraordinary evidence to convince us that this is not natural. To think Antarctica should stay the same as it was when we were children is to commit the error of base-rate neglect. Remember this: the Arctic is losing a bit of ice each year, and the Antarctic is gaining a bit.Not much. And not quickly.
If the worst isn’t going to happen, a small rise in temperature should benefit society. CO2 helps plants grow. Excessive cold kills far more people than excessive heat does.
3. What does the increase in greenhouse gases mean for oceans, environment, animals, habitats, and humanity?
This is the domain of climate models. I could write twenty pages, but I’ll summarize my research:
- According to Bob Tisdale, a researcher I respect after reading his book Climate Models Fail, the IPCC models simply aren’t skillful. They failed to predict the past twenty years, they don’t realistically model the cloud response, and there is simply too much uncertainty about the inputs to get decent outputs.
- NASA GISS, in realizing that global temperatures refuse to conform to their models, has said that the increase in heat is trapped in the oceans. This bit of model trickery also does not stand up to careful analysis.
- The IPCC models are falsifiable — if temperature doesn’t go up over the next ten years or so, we will have to agree that the IPCC models are, and always were, dead wrong. It is not looking good.
- According to J Scott Armstrong, all climate models so far don’t meet the minimum criteria for a skillful forecast. He has testified before congress on climate forecasts, polar-bear counts, and other misconceptions. Here is his 15-minute talk:
Armstrong and other modeling experts say the simple “no change” prediction is often far superior to a complex one with many independent variables. In that case, we can predict about another one-degree C rise for this century, and another 3–7 centimeters of gradual sea-level rise.
Smoking Gun #4: Rigged Inputs and Wrong Assumptions About Feedback Lead to Computer Model Failure.
Correlation is not Causation
Killer storms. Bee colony collapse. Mosquito-borne diseases. Ticks heading south for the winter. Heat-related deaths. Arctic lobster populations. Algae blooms. Global temperatures. These things may or may not be increasing, but let’s assume they are. Atmospheric carbon dioxide is also increasing. So are the number of toilets made every year and the number of vinyl records sold. When a particular scientist issues a press release describing the future collapse of ecosystems, I recommend asking “What evidence do you have?” When they say something we can see today is due to “anthropogenic global warming,” they are saying that the extra 120 parts per million of CO2 in the atmosphere — about 30% of the total — are causing the phenomenon right now, as opposed to all other possible natural explanations, including variance. I recommend asking, “How can you be sure?” Just because we haven’t seen something in the past century doesn’t mean it wasn’t going to occur anyway.
This is the scientific method — ask hard questions, develop hypotheses, and try to disprove them. Not only do we need better models, we need to be empirical, not hysterical. We need to look at the data and separate the signal from the noise. The majority of single papers showing research results are simply wrong. To get a better picture of scientific findings, one of the best tools is the metastudy.
Smoking Gun #5: All metastudies so far disagree with the IPCC projections.
We only have two so far, but they are significant: one on temperature, and one on ocean acidification. Anyone who claims otherwise is going to have to explain why his/her claim invalidates the metastudies. That’s a lot to ask, but this is the level of proof science demands.
4. Is decarbonization the right solution?
Okay, but even if there’s a lot of uncertainty, what about the small possibility that something really bad could happen? Shouldn’t we put money and resources into doing something, just as an insurance policy?
We could, but we have to balance that against buying other things with the same money and effort*. Right now, some ecosystems are fragile and threatened by humanity, while many others are already repairing themselves*. The focus on CO2 may be misplaced. It’s not the CO2 that causes choking smog in Los Angeles, it’s the rest of the mix that comes from the power plant and out of exhaust pipes. It’s the fact that China needs to build a new city the size of Phoenix every month for the next 15 years. More people are eating a western diet, contributing to deforestation and wasting resources. Overfishing is a crisis in progress. This and much more is actually happening today, not in a computer model.
The Bush administration held up the Kyoto agreement, yet they spent trillions on a war based on no verifiable evidence to prevent a future that was never going to happen. Should we really do the exact opposite?
Enter Bjorn Lomborg, the “skeptical environmentalist,” who has spent his mediagenic career trying to prioritize our efforts to save the earth and humans along with it. According to his calculations, the EU’s goal of spending $250 billion per year until the end of the century will result in — and this is not a typo — 0.1 degree lower temperatures.
Lomborg’s book, Cool It, and movie of the same name, are excellent (though for some reason he believes the IPCC projections). He says we should switch to renewable sources of energy, but for the right reasons at the right price.
That’s my attempt to answer the four questions. For a good summary, see Nir Shaviv’s paper or Bob Tisdale’s excellent ebook. In the next three sections, I’ll quickly list people not to listen to and why, then I’ll list people I think we can trust.
This section is a guide to the IPCC and people sounding the alarm of impending climate doom.
The Intergovernmental Panel on Climate Change
The “mainstream climatologist” view is generally embodied by the IPCC. In 2007, the IPCC shared the Nobel Prize with Al Gore. Once I started to learn about the IPCC and the people who have left it and why, I started to question their motivations. The big shift came when I read a book called The Delinquent Teenager Who Was Mistaken for the World’s Top Climate Expert by Donna LaFramboise, detailing the methods and motivations of the IPCC. I highly recommend reading Laframboise’s book*; here are a few highlights:
- The IPCC operates in secrecy, leaves out critical pieces of data, relies too heavily on unproven measuring schemes, and tends to make unsupported sensationalist claims that support a politically-motivated, pre-determined agenda.
- Chris Landsea, a hurricane expert, resigned from the IPCC after a lead author for the IPCC and its chairman claimed that there would be more intense and more frequent storms as a result of man-made greenhouse gases. In his resignation letter, he wrote “I personally cannot in good faith continue to contribute to a process that I view as both being motivated by pre-conceived agendas and being scientifically unsound.”