On Monday, the Oregon Institute of Science and Medicine announced that more than 3,000 scientists have signed a petition rejecting the theory that humans are causing catastrophic global warming. The list of signers features scientists from all disciplines, including physics, climate research, mathematics and engineering. It has more than nine thousand scientists with PhDs.

The institute says the large number of signers contradicts the claim that there is a scientific consensus about human responsibility for climate change. And, it points out the petition has more than 15 times as many scientists as the number involved in the United Nations' Intergovernmental Panel on Climate Change.