League of Conservation Voters Ratings
The League of Conservation Voters (LCV) is a political advocacy organization founded in 1969 by American environmentalist
David Brower, in the early years of the environmental movement. LCV's mission is to "advocate for sound environmental policies
and to elect pro-environmental candidates who will adopt and implement such policies."
The LCV ratings are a percentage (i.e., on a scale of 1 to 100, with a higher score considered environmentally friendly). Calculations are
based on the votes of Members of Congress on key environmental legislation such as the Dirty Air Act and "Funding Renewable Energy," with a
legislator's absence from a vote counted as a negative to be deducted from his or her score.
The League is headquartered in Washington, DC.
Sources: lcv.org, wikipedia.org