There is actually quite a bit of dissent on climate, just no alternative model. Rather, people are arguing over the degree of accuracy of the popular ones.

The consensus is that the planet is in a warming cycle, but there are still considerable differences between the experts regarding the speed, and reasons. Some people put more emphasis on carbon, some more on methane, some solar, etc.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)