Gary Troyer's "Global warming" letter on July 25, referencing an article about climate modeling, claimed it showed how poorly we understand climate, then he goes on to disparage President Obama for a remark that "the science is settled," implying we know very little about global warming after all.
That is a complete misrepresentation of the article: www.tinyurl.com/pq9m2wm.
The article does not dispute any of the data or theories of climate science, nor does it claim the current, physics-based models are wrong. Instead, it reports some scientists are trying different modeling techniques to improve the accuracy of the predictions. When the goal was just improving science, the physics-based models were very useful, but now there is an additional goal: forming the best climate change policies.
For policy purposes, more accurate predictions are needed over longer periods. This will help convince people of the reality of the problem, and to select the best ways to avoid it. It's a desirable goal, but it is most unlikely we'll discover the problem is small or nonexistent. Each time a new Intergovernmental Panel on Climate Change's Assessment Report is issued, it is almost always observed that the climate models have underestimated the rise in global temperature and the effects of climate change.
ERIC GREENWELL, Richland