In July Americans went online searching for information about green initiatives related to automotive transportation driven by the launch of the federal Cash for Clunkers program, with visitations to green sites growing 15 percent in July to 17.

5 million visitors, according to comScore.Auto manufacturer sites saw growth as well, jumping 14 percent to 27.1 million visitors, representing a high for the category in the past year. General Motors lead the category with 7 million visitors up 20.