“Predictions of future climate trends by Stephen Schneider and other leading climatologists, based on the prevailing knowledge of the atmosphere in the early 1970s, gave more weight to the potential problem of global cooling than it now appears to merit.”

– Paul and Anne Ehrlich, Betrayal of Science and Reason (Washington: Island Press, 1996), p. 34.

Recent attention has been paid to the coming Ice Age talk of John Holdren and Steven Schneider before they got global warming religion.

Here are some “global cooling” quotations and comments from an earlier era. While such concern was not a scientific ‘consensus,’ such as that created by the United Nations’s Intergovernmental Panel on Climate Change in favor of high-sensitivity anthropogenic global warming, the Ice Age scare was a very active hypothesis that should give pause to the Boiling Age purveyors of today.…

“From the East Coast to the West and across the political spectrum, House lawmakers remain divided over how to protect America from losing a competitive edge to China and other nations under climate change legislation.

“At issue is how to prevent cement, steel, aluminum and other energy-intensive industries from responding to proposed new laws that could have the effect of slashing emissions by shuttering factories only to reopen them in countries unfettered by costly regulations.”

– Lisa Friedman, “Climate law poses trade risks; lawmakers unsure how to respond” E&E News, April 28, 2009 (subscription)

Marlo Lewis’s post, Is Cap-and-Trade Inherently Protectionist?, linked carbon dioxide regulation, U.S.-side tariffs (“border adjustments”), and international protectionism. Indeed, the interventionist dynamic–regulation expanding from its own complications and shortcomings–is a major theme of political economy.…

The funny thing about carbon pricing is that even if you take the latest IPCC report as gospel, and even if you assume all of the governments around the world implement a perfectly efficient carbon tax, even so the “efficient” carbon tax ends up being fairly low for a few decades, and then it ramps up as atmospheric concentrations increase.  (See William Nordhaus’s new book treatment of his “DICE” model for an excellent exposition.)

The intuition behind this result is that even the scary projections of catastrophic climate change don’t occur for more than one hundred years, and so discounting these future damages to the present leads to a modest externality from current emissions of another ton of carbon dioxide.

This phenomenon explains the fury with which partisans in the climate change debate argue over the proper “social discount rate.” …