That’s because, under the company’s guidelines, climate content can be classified as opinion and therefore exempted from fact-checking procedures. The policy means that peer-reviewed science can be lumped into the same category as industry statements and even blatant disinformation. In September, for example, the CO2 Coalition, a nonprofit group that says increased carbon emissions are good for the planet, successfully overturned a fact-check when Facebook quietly labeled its post as “opinion.”