See
this..
There are basically no credible scientists arguing if global warming is a thing. There are also no credible scientists arguing over whether it will negatively impact humanity. The argument is over what's causing it and the magnitude of the damage. Please note that the consensus is that the damage will be massive, it's just about _how_ massive....
As for social science, human behavior can be measured and predicted. You seem to dismiss this outright because our methods to date have been less than prefect. Also, if you're not actually in the social sciences and taking time out of your day to read the entirety of their works it does appear like a false dichotomy because you're reading sensationalized summaries from click hungry news sights. They're not going to go over the discussions of grey area in the main papers since those don't make good headlines...