Facebook has two different standards when it comes to fact-checking on climate.
After being questioned by Senators Elizabeth Warren, Tom Carper, Sheldon Whitehouse, and Brian Schatz about allowing "climate disinformation to spread on their platforms", Facebook has revealed that it does review climate misinformation but opinion pieces are not subject to fact-checking.
The policy about not fact-checking opinion pieces on climate was introduced in 2016.
In a letter shared with The Verge, Facebook said: "We do review and rate climate misinformation, and there has never been a prohibition against them doing so. Facebook will continue its policy of exempting "clear opinion content" from fact-checking."
Senators Warren, Carper, Whitehouse, and Schatz said: "We asked Facebook leadership to close the loopholes that let climate disinformation spread on their platforms. Their response: we should trust them to make and follow their own rules and procedures, even if it results in the distortion of facts and the mass dissemination of falsehoods. The future of our planet is at stake, and there should be no company too big, too powerful, and too opaque to be held accountable for its role in the climate crisis. Facebook is no exception."