When it comes to extreme weather, climate activists want to have their cake and eat it. Many acknowledge that it is unscientific to attribute any particular weather event to global warming. But then, in the same breath, they’ll say that this or that drought, flood, or hurricane is “consistent with” the types of weather “scientists” predict will become more frequent in a warming world.
Or they’ll say that such weather is “exactly what global warming looks like.” Or they’ll say that because “all weather events are affected by a warming planet,” the burden of proof is now on skeptics to show that climate change did not cause or contribute to a particular weather-related disaster.
Some activists, though, simply come right out and assert what others insinuate. Plaintiffs in Comer v. Murphy Oil, a case that made it all the way to a federal appeals court, claimed that carbon dioxide (CO2) emissions from ExxonMobil, American Electric Power, and other U.S. energy and power companies contributed to global warming, which intensified Hurricane Katrina, which in turn wrought death and destruction upon the citizens of New Orleans.
There was a major “anthropogenic” component to the New Orleans disaster — but it was not the emissions. Decade after decade, policymakers failed to improve a levee system “predicted to fail in a major hurricane,” as Cato Institute climatologist Patrick Michaels noted at the time.
Although always a staple of global warming advocacy, climate activists have turned up the rhetorical heat on extreme weather in recent years. The reasons aren’t hard to fathom. The 15-year pause in global warming makes it harder to scare people about warming itself. The two greatest terrors featured in An Inconvenient Truth — rapid ice sheet disintegration leading to catastrophic sea-level rise and ocean circulation shutdown precipitating a new ice age — have no credibility. Nobody takes seriously the prospect of warming-induced malaria epidemics either. If you want to scare people, extreme weather is the only card left in the climate alarm deck.
In addition, a rationally-ignorant public can easily be fooled into confusing climate change risk with plain old climate risk (the nasty surprises Mother Nature generates all on her own). Part of the reason is psychological. Due to their sheer magnitude and terror, natural catastrophes have an almost supernatural aspect. People are naturally inclined to imagine that natural disasters have non-natural causes. Thus, each time disaster strikes, pundits, especially those with scientific credentials, can plausibly blame fossil fuels — just as in earlier ages political or religious authorities blamed “sinners” (i.e., their adversaries) for floods, plagues, crop failures, and the like.
Perhaps the leading debunker of extreme-weather hype on the scene today is University of Colorado Prof. Roger Pielke, Jr., who testified last week before the Senate Environment and Public Works Committee at a hearing titled “Climate Change: It’s Happening Now.”
As his testimony notes, Pielke, Jr. is not a climate change skeptic. He affirms, for example, that “Humans influence the climate system in profound ways, including through the emission of carbon dioxide via the combustion of fossil fuels.” However, he regards the oft-asserted linkage between global warming and recent hurricanes, floods, tornadoes, and drought as “unsupportable based on research and evidence.” Highlights of his testimony appear below. [click to continue…]