A draft version of the U.S. Global Change Research Program Climate Science Special Report has been leaked to The New York Times.
Notwithstanding the Times' alarmist headline suggesting "drastic" climate impacts on the U.S., a glance through the 545-page report finds that it is essentially an aggregation of climate change studies that support the scientific consensus that man-made global warming is occurring.
According to the report, the global annual average temperature has increased by more than 1.6°F (0.9°C) from 1880 to 2015; the average annual temperature of the contiguous U.S. has increased by about 1.2°F (0.7°C) between 1901 and 2015. Climate models project increases of at least 2.5°F (1.4°C) over the next few decades, which means that recent record-setting years in the U.S. will be relatively "common" in the near future.
The report concurs with the Intergovernmental Panel on Climate Change's conclusion that it is "extremely likely that most of the global mean temperature increase since 1951 was caused by human influence on the climate." The report also finds that extremely cold days in the U.S. have become fewer while the number of extremely hot days has increased. In addition, extreme percipitation events have become more common in the U.S. The report notes that there is still considerable controversy among researchers when it comes to future trends in hurricane frequency and intensity.
Politicians, like most people, don't want to hear bad news that appears to contradict their views. The saga of how the the first National Climate Assessment fared under the George W. Bush administration is cautionary tale. Basically, Bush administration officials edited the report in ways that suggested greater uncertainty about scientific findings than the researchers who put together the report thought were warranted. That effort backfired when the administration's artful editing was leaked to and reported by the media.
The new report states that "it does not include an assessment of the literature on climate change mitigation, adaptation, economic valuation, or societal responses, nor does it include policy recommendations." This appears to be accurate, though the report does note that "significant reductions in global CO2 emissions relative to present-day emission rates" would be needed to meet the Paris Agreement on Climate Change's goal of limiting future warming to below 2°C.
Scientific data can identify a problem, but they do not tell policy makers the right way to handle a problem. Maybe the best thing to do is to let emissions increase while growing the economy as fast possible, so as to create the wealth and technologies that will enable future generations to deal with whatever problems climate change may generate. Or perhaps more research needs to be directed toward developing cheap low-carbon energy technologies.
The report was no doubt leaked by someone with an agenda, and I don't blame anyone in the Trump administration who thinks a shadow science group of Obama leftovers is trying to thwart what it perceives as the president's climate and energy policies. In any case, since that the draft report is available to anyone with an internet connection, it would be ridiculous for officials to try to "suppress" it now.
Update: Climate report found over at Internet Archive. Fox News cites several researchers who assert that that means it's been public for months. When the National Academy of Sciences released its report evaluating the process for how the draft Special Report was put together, I did a fairly extensive online search for the draft report and could not find it. Even now over at the official federal U.S. Global Change Research Program (USGCRP) website the link to any copy of the report appears to be absent—maybe because the comment period is over? Even so, why not leave the report available on the website for interested members of the public to read?
The final report is supposed to be released by August 18. Assuming that the deadline is met, it will be interesting to see what changes have been made in that version.
In any case, a #FakeNews tweet from the president is no doubt in the offing.