NY TIMES CORRECTION

An article in Science Times on Tuesday, August 23, about a climatologist’s resignation from a panel advising the Bush administration on temperature changes in the atmosphere mischaracterized his position on global warming. The scientist, Roger A. Pielke Sr. of Colorado State University, says that warming is caused mainly by human activities; he does not disagree with that widely held view. Where he differs with many peers is on the amount of warming from the accumulation of gases like carbon dioxide, as opposed to other factors; the reliability of temperature measurements on the Earth’s surface; and the value of computer projections that estimate future climate change.