You’d sure think it was agreed upon by science, if people went around suppressing any information that said otherwise, wouldn’t you?
The truth is that the science isn’t settled at all. We know that the earth is slightly warmer now than it was 100 years ago, but whether humans caused this, whether it’s bad for us, or if we can somehow undo it, are questions that are not settled at all. Shutting down one side of the debate isn’t helpful, and should raise even more questions, since the side that wants to shut down all the naysayers also wants to drastically change the economic structure of the world in an attempt to “deal with it”.