Happy Earth Day! Unless You’re Running for President in the GOP

Earth Day finds Republican candidates questioning global warming.

In this handout photo provided by the European Space Agency (ESA) on July 17, 2014, German ESA astronaut Alexander Gerst took this image of the Earth reflecting light from the sun whilst aboard the International Space Station (ISS).

Photo by Alexander Gerst / ESA via Getty Images

It’s Earth Day, but that isn't stopping Republican presidential candidates from questioning whether global warming is real, whether humankind is causing it or whether plans to address the problem will bankrupt the economy.

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