In the face of those who continue to deny climate change, 375 leading scientists who are members of the National Academy of Sciences penned an open letter addressing the consequences of such dangerous denial. The signers include 30 Nobel laureates. They work at top universities around the world. Stephen Hawking is a signer, as is former NASA scientist Jim Hansen. The scientists wrote their letter as a warning of what could happen should a US president withdraw from the Paris climate agreement.

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“Human-caused climate change is not a belief, a hoax, or a conspiracy. It is a physical reality. Fossil fuels powered the Industrial Revolution. But the burning of oil, coal, and gas also caused most of the historical increase in atmospheric levels of heat-trapping greenhouse gases. This increase in greenhouse gases is changing Earth’s climate,” the scientists write in their letter published on the Responsible Scientists website.

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According to the scientists, we can see climate change in phenomenon such as sea level rise, the melting of Arctic sea ice, and ocean acidification. The scientists spoke out to those who maintain we need “absolute certainty” to know if we are truly causing climate change before taking action. “Absolute certainty is unattainable,” they said, and that they are “certain beyond a reasonable doubt” that climate change is real, caused by humans, and dangerous.

The scientists also spoke out against the “Republican nominee for President” who has said he might withdraw the United States from the Paris climate agreement in a “Parexit.” The scientists were clear when they wrote, “Walking away from Paris makes it less likely that the U.S. will have a global leadership role, politically, economically, or morally.” They said climate change is a global problem, requiring global strategies, and withdrawing from the Paris agreement would signal a departure from the global community.

You can read the full letter at ResponsibleScientists.org.

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