Right, the climate scientists are looking at all relevant factors. This is an excellent video looking at Sandy and recent trends:
One of the scientists interviewed, Dr. Kerry Emanuel of MIT, quips about the slight cooling we saw from the 1950's to the 1980's as resulting from the black lining in a silver cloud that was the Clean Air Act. In other words, we were getting shading from particle and aerosol pollution, and now that we have cleaned up our air, we have resumed the warming trend.