As Americans observe Earth Day, Gallup finds 42% of Americans identifying themselves as environmentalists, down from an average of 76% in the late 1980s and early 1990s.
The results are based on Gallup's annual Environment poll, conducted March 2-6. When last asked, in 2000, 47% of Americans identified as environmentalists, which in turn was down from 63% in 1995. In 1991 -- one year after Earth Day became a global event celebrated each April 22 -- a high of 78% of Americans described themselves that way.
One reason for the decline is that the environment has become politicized as an issue, especially in terms of the debate over climate change and how to address it. In 1991, the same high percentage of Republicans and Democrats -- 78% -- considered themselves environmentalists. Today, 27% of Republicans think of themselves that way, compared with 56% of Democrats, a partisan gap of 29 percentage points.