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Thirty-one scientific societies last week wrote to members of Congress, urging them to accept that climate change is real. The letter comes at a time when many Republicans in Congress, including members of committees with responsibility for science spending and science policy, dispute the scientific consensus that climate change is happening.

"We, as leaders of major scientific organizations, write to remind you of the consensus scientific view of climate change," the letter says. "Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research concludes that the greenhouse gases emitted by human activities are the primary driver. This conclusion is based on multiple independent lines of evidence and the vast body of peer-reviewed science."