I do appreciate your continual effort to keep your readers informed about the science of climate change. Although clobbered from all sides, science is still our best bet at guessing our future. But I am dubious about your article reporting on the research by Andreas Schmittner of Oregon State University, which purports to show that climate may not be as sensitive to carbon dioxide as previously believed (“Good News at Last?” November 26, 2011). To begin with, the very question mark in your title smack of tabloids. More important, it has long been known that carbon dioxide is but topmost of many gases in terms of its greenhouse effect. Methane, ozone, and nitrous oxide are very important, as well. And so is the good old water vapor. In short, it would be good to temper your enthusiasm when it comes to research like the one reported. The perils of climate change have been repeatedly compromised by poor understanding of scientific research. By now, few people pay any attention to it. When it comes to science, it is essential to keep an even keel.