Re "Kerry wrong on human's ability to affect climate change" (Letters, Feb. 19): The letter writer claims that believing in human causes of climate change is naive.
Perhaps in addition to Secretary of State John Kerry, he should address his criticism to the American Chemical Society, which states, "Data for the past 2,000 years show that the atmospheric concentrations of carbon dioxide (CO2) ... have increased substantially since 1750. CO2 never increased more than 30 ppm during any previous" millennium "but has risen by 30 ppm in the past two decades."
Further, the Society points to the ratio of C-13 to C-12 isotopes in new CO2 as proof the increase is from human combustion of fossil fuels.
The letter writer can believe whatever he likes, but actual proof of his argument requires more than just his assertion. It requires data, analysis, knowledge, and willingness to let evidence rule. His arguments, and those of other climate change deniers, have demonstrated none of these qualities.
-- Jack Peterson, Roseville