Maria Energia reported that

Yesterday Merrill Lynch (MER) announced that it’s started tracking energy-efficient companies that it considers well-positioned to benefit from tough global warming policies.
The Merrill Lynch Energy Efficiency Index is currently made up of 40 companies from around that globe that fit the criteria of great growth potential from the increased emphasis on energy efficiency and cutting carbon dioxide emissions that cause global warming. The index is divided into four components (from the news release): more