Yesterday’s MasterResource post looked at the potential climate impacts of the proposed Waxman-Markey Climate Bill. But I limited my analysis to only U.S. actions—after all, Waxman-Markey can’t mandate international man-made greenhouse gas reduction timetables. But, what would happen if the rest of the world wanted to join in?
The Bottom Line
The ability of the industrialized world, through emissions reductions alone, to impact the future course of global climate is minimal. If the U.S., Canada, Australia, Japan, Europe, and former Soviet countries all limited their emissions of greenhouse gases according to the schedule laid out under Waxman-Markey—a monumental, unexpected development—it would, at most, avoid only a bit more than one-half of a °C of projected global warming (out of 4.5°C—or only about 10%). And this is under worst-case emissions assumptions; middle-of-the-road scenarios and less sensitive climate models produce even less overall impact.…
Editor Note: Using mainstream models and assumptions, Mr. Knappenberger finds that in the year 2050 with a 83% emissions reduction (the aspirational goal of Waxman-Markey, the beginning steps of which are under vigorous debate), the temperature reduction is nine hundredths of one degree Fahrenheit, or two years of avoided warming by 2050. A more realistic climate bill would be a fraction of this amount. The author will respond to technical questions on methodology and results and invites input on alternative scenarios and analyses.
“A full implementation and adherence to the long-run emissions restrictions provisions described by the Waxman-Markey Climate Bill would result only in setting back the projected rise in global temperatures by a few years—a scientifically meaningless prospect.” (from below)
The economics and the regulatory burdens of climate change bills are forever being analyzed, but the bills’ primary function—mitigating future climate change—is generally ignored.…
In the realm of climate science, as in most topics, there exists a range of ideas as to what is going on, and what it means for the future.
At the risk of generalizing, the gamut looks something like this: Ultra-alarmists think that human greenhouse-gas-producing activities will vastly change the face of the planet and make the earth inhospitable for humans; they therefore demand large and immediate action to curtail greenhouse gas emissions.
Alarmists understand that human activities are changing the earth’s climate and think that the potential changes are sufficient to warrant some pre-emptive action to try to mitigate them.
Skeptics think that humans activities are changing the earth’s climate but, by and large, they think that the changes are not likely to be terribly disruptive (and even could be, in net, positive) and that drastic action to curtail greenhouse gas emissions is unnecessary, difficult, and ineffective.…