It's not just Fox. It's a problem with journalists in general.
Journalists are taught to present "both sides" of a story. This approach, however, leads to journalists giving charlatans "equal time." Thus, the public wrongly assumes that scientists must be split 50/50 on important issues like climate change. The reality, of course, is that the split is far closer to 99/1 than to 50/50.
The REAL underlying problem is that journalists don't know enough science to be able to spot a crackpot when they see/hear one.