The right-wing echo chamber is promoting an op-ed written by mathematician and engineer David Evans, which they claim is part of the “demolition of the theories” behind man-made climate change. But Evans is not a climate scientist, and claims he is pushing in his op-ed have long been discredited.

Evans himself does not claim to be a climate scientist. According to a resume posted on his research firm's website, Evans is a mathematician and engineer. He also “sells information for investors about gold companies.” As DeSmogBlog pointed out, his resume lists no published, peer reviewed articles that deal with climate science. Studies have shown a strong consensus among actively-publishing climate scientists that human activity is contributing to climate change and that “the relative climate expertise” of skeptics is “substantially” lower.

Evans' questionable credentials on climate science were no problem for right-wing bloggers. Hot Air pushed Evans' claims with a post titled, “Former 'alarmist' scientist says Anthropogenic Global Warming (AGW) based in false science.” Fox Nation subsequently joined in, linking to the Hot Air post and declaring, “Scientist Flips, Blows Global Warming To Bits.”

However, Evans's claims aren't anything new. He's been making them for years.

Evans was roundly debunked back in 2008 after he brought his claims to the media. Skeptical Science has a thorough debunking of Evans' scientific falsehoods here.