Dedicated to the balanced discussion of global warming
This article is fairly accurate. It doesn’t point out the real reason that Hansen was wrong and that anthropogenic global warming (AGW) has essentially slowed down to almost stopped.
The real reason is that it is the physical and energy nature of the CO2 molecule that it simply has no more radiation to absorb. CO2 can only absorb a very narrow band of radiation and that radiation is approximately 95-98% absorbed already. You could triple the CO2 in the atmosphere and all you would do is decrease that narrow band closer and closer to 0% (it is impossible to get 100%). That simply means a 2-4% increase in absorption in about 1/10th of the wavelengths that are long enough to be called “heat”.
AGW due to CO2 is essentially done and has been for about 15-20 years. There are other forms of AGW that are far more dangerous but they are primarily focused around methane and increased H2O in the atmosphere.
Hansen was and is a fool. He predicted the end of the world and was completely wrong. When the scientific evidence started to come against him, he doubled down on it and orchestrated aggressive tactics to tamp down dissent. His footnote in history will be that he didn’t understand the science and when it was obvious that he was wrong he used his considerable political power to eliminate those that had better science on their side.
30 years ago today was a bad day. It started a spin cycle of misinformation and an effort to take money from some people and give it to others.
By Pat Michaels and Ryan Maue
June 21, 2018 7:24 p.m. ET
James E. Hansen wiped sweat from his brow. Outside it was a record-high 98 degrees on June 23, 1988, as the NASA scientist testified before the Senate Committee on Energy and Natural Resources during a prolonged heat wave, which he decided to cast as a climate event of cosmic significance. He expressed to the senators his “high degree of confidence” in “a cause-and-effect relationship between the greenhouse effect and observed warming.”
With that testimony and an accompanying paper in the Journal of Geophysical Research, Mr. Hansen lit the bonfire of the greenhouse vanities, igniting a worldwide debate that continues today about the energy structure of the entire planet. President Obama’s environmental policies were predicated on similar models of rapid, high-cost warming. But the 30th anniversary of Mr. Hansen’s predictions affords an opportunity to see how well his forecasts have done—and to reconsider environmental policy accordingly.
Mr. Hansen’s testimony described three possible scenarios for the future of carbon dioxide emissions. He called Scenario A “business as usual,” as it maintained the accelerating emissions growth typical of the 1970s and ’80s. This scenario predicted the earth would warm 1 degree Celsius by 2018. Scenario B set emissions lower, rising at the same rate today as in 1988. Mr. Hansen called this outcome the “most plausible,” and predicted it would lead to about 0.7 degrees of warming by this year. He added a final projection, Scenario C, which he deemed highly unlikely: constant emissions beginning in 2000. In that forecast, temperatures would rise a few tenths of a degree before flatlining after 2000.
Thirty years of data have been collected since Mr. Hansen outlined his scenarios—enough to determine which was closest to reality. And the winner is Scenario C. Global surface temperature has not increased significantly since 2000, discounting the larger-than-usual El Niño of 2015-16. Assessed by Mr. Hansen’s model, surface temperatures are behaving as if we had capped 18 years ago the carbon-dioxide emissions responsible for the enhanced greenhouse effect. But we didn’t. And it isn’t just Mr. Hansen who got it wrong. Models devised by the United Nations Intergovernmental Panel on Climate Change have, on average, predicted about twice as much warming as has been observed since global satellite temperature monitoring began 40 years ago.
What about Mr. Hansen’s other claims? Outside the warming models, his only explicit claim in the testimony was that the late ’80s and ’90s would see “greater than average warming in the southeast U.S. and the Midwest.” No such spike has been measured in these regions.
As observed temperatures diverged over the years from his predictions, Mr. Hansen doubled down. In a 2007 case on auto emissions, he stated in his deposition that most of Greenland’s ice would soon melt, raising sea levels 23 feet over the course of 100 years. Subsequent research published in Nature magazine on the history of Greenland’s ice cap demonstrated this to be impossible. Much of Greenland’s surface melts every summer, meaning rapid melting might reasonably be expected to occur in a dramatically warming world. But not in the one we live in. The Nature study found only modest ice loss after 6,000 years of much warmer temperatures than human activity could ever sustain.
Several more of Mr. Hansen’s predictions can now be judged by history. Have hurricanes gotten stronger, as Mr. Hansen predicted in a 2016 study? No. Satellite data from 1970 onward shows no evidence of this in relation to global surface temperature. Have storms caused increasing amounts of damage in the U.S.? Data from the National Oceanic and Atmospheric Administration show no such increase in damage, measured as a percentage of the gross domestic product. How about stronger tornadoes? The opposite may be true, as NOAA data offers some evidence of a decline. The list of what didn’t happen is long and tedious.
The problem with Mr. Hansen’s models—and the U.N.’s—is that they don’t consider more-precise measures of how aerosol emissions counter warming caused by greenhouse gases. Several newer climate models account for this trend and routinely project about half the warming predicted by U.N. models, placing their numbers much closer to observed temperatures. The most recent of these was published in April by Nic Lewis and Judith Curry in the Journal of Climate, a reliably mainstream journal.
These corrected climate predictions raise a crucial question: Why should people worldwide pay drastic costs to cut emissions when the global temperature is acting as if those cuts have already been made?
On the 30th anniversary of Mr. Hansen’s galvanizing testimony, it’s time to acknowledge that the rapid warming he predicted isn’t happening. Climate researchers and policymakers should adopt the more modest forecasts that are consistent with observed temperatures.
That would be a lukewarm policy, consistent with a lukewarming planet.
Mr. Michaels is the director and Mr. Maue an adjunct scholar at the Cato Institute’s Center for the Study of Science.
Appeared in the June 22, 2018, print edition as ‘A Hot Summer on Capitol Hill.’