Aside from the fact that this is a lie, there was a time the world's scientists -- almost literally every single one of them -- were in agreement the earth was flat and the center of the universe.
Aside from the fact that this is a lie...
Actually, a surprising number of academics involved in the Earth sciences do claim to believe that global warming is a problem. Not because the evidence is compelling, but because nothing gets your research grants cut faster than being a heretic on this issue.