Happy Earth Day!

Via Gallup:

Over the past decade, Americans have clustered into three broad groups on global warming. The largest, currently describing 39% of U.S. adults, are what can be termed “Concerned Believers” — those who attribute global warming to human actions and are worried about it. This is followed by the “Mixed Middle,” at 36%. And one in four Americans — the “Cool Skeptics” — are not worried about global warming much or at all.

The rate of Concerned Believers has varied some over the past decade and half, but is currently identical to the earliest estimate, from 2001. Over the same period of time, the ranks of Cool Skeptics have swelled, while the Mixed Middle — once the largest group — has declined modestly.