The four - year study is the first real - world trial looking at the effects of human behavior at the pump on urban air pollution. (sciencedaily.com)
If urban air pollution turns the same trick, then rainfall near large cities may be suppressed markedly. (sciencemag.org)
But most of what they are doing is not visible, because it is rooted in local concerns, such as urban air pollution, rather than fear of global warming. (scientificamerican.com)