Fred Krupp gets everything wrong in “Methane and Other Climate Bargains” (op-ed, Nov. 2), his argument for sharp and “virtually cost-free” reductions in methane emissions. Using the EPA climate model, Mr. Krupp’s 30% reduction in methane emissions would reduce temperatures in 2100 by six one-hundredths of one degree Celsius, an effect that would not be detectable because it is only about half the normal variation in global temperatures. The effect of reducing the burning of the tropical rainforests by that same 30% would be five one-hundredths of one degree Celsius.

On cyclones, droughts and other climate phenomena, Mr. Krupp simply ignores the data. There is no evidence of climate “instability” or of a “crisis.” More generally, Mr. Krupp seems to believe that governments will adopt “lowest-cost” policies and that reductions in emissions will be a free lunch. Can anyone believe such silliness?

Benjamin Zycher

American Enterprise Institute

Long Beach, Wash.