Nearly two-thirds of Americans think climate change is upon us

The share of U.S. adults who thinks the effects of global warming have already begun, will happen in the future, or will never happen

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"Will happen in the future" includes respondents who think the effects of global warming will happen within a few years or within their lifetime, or will not happen within their lifetime but will affect future generations.

Chart: Andrew ManganSource: GallupCreated with Datawrapper