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.