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Greens inhale helium, read Trump tweets on global warming

Environmentalists are finding Donald Trump‘s past tweets on global warming funny — especially with the help of helium.

The Sierra Club released a video Thursday afternoon showing people reading past Trump tweets about global warming after inhaling helium, giving them unnaturally high-pitched voices.

Many of the individuals who read the tweets end up breaking down in laughter, but the video ends with a more cryptic message.

“Denying climate change might sound funny,” reads a graphic, “but voting for a climate denier is not.”

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The video ends with Democratic nominee Hillary Clinton delivering an applause line during a Florida rally with former Vice President Al Gore calling climate change real and an urgent issue.