Reducing pollution seems like a pretty straight forward proposition, if human activity creates waste, that waste should be disposed of in such a way as to not harm the environment. It is something that can be measured, and often the benefits are immediately apparent.
Earth Day 2015
The more conservative parts of the country tend also to be some of the more rural, where the farms and ranches are, where Americans live closest to the land. These areas have the greatest concentrations of hunters, farmers and sportsmen in the country, in short those with the most to lose by not respecting Mother Earth.