For this list, Newsweek pulled all of the tech companies, including both hardware and software makers, from its 2011 greenest companies in the world list.
An unrelated recent study, entitled "Analysis of Small Business Innovation in Green Technologies," by the U.S. Small Business Administration found that small business leads the way in "green technology innovation" in America. According to a press release, small business only accounts for eight percent of U.S. patents, yet they account for 14 percent of green tech patents.
More information about Newsweek's 2011 Green Rankings methodology can be found here.
View the 2011 Green Rankings list below courtesy of Newsweek/The Daily Beast.