Skepticism about climate change has resurfaced, as some experts claim the exact causes of global warming remain unclear and that the policies addressing it are motivated more by money than by science.

Richard Lindzen, Professor Emeritus of Meteorology at the Massachusetts Institute of Technology (MIT), has spent decades studying atmospheric science. He told the Daily Mail that the public hysteria surrounding global warming isn’t actually based on realistic data.

Read more: Top MIT scientist blasts ‘climate hysteria,’ says global warming fears are driven by money… not evidence