While I get your point, unless any of us here have the education and years of scientific analysis required to have an informed opinion here, all of us here really only have a couple choices.
1. Place trust that the scientists are doing their best to provide information based on their best methods available.
2. Place doubt on the scientists or believe that the scientists have been manipulated by some power to state things that are not true.
The problem is that there is not a scientifically verifiable framework for any of this. It is about probabilities and just like the weather when 90% of the models say it is going to be sunny - 1 time out of 10 it will rain. You will be fine 9 out of ten times and the one time out of ten you will be mad when you didn't bring an umbrella and be mad that the weather prediction was "wrong". On that 1 day, they verified the models that said it was going to rain were correct, but that doesn't mean those models are more reliable than the models that said it was going to be sunny.
Right now scientists are modeling global temperature changes over the next several decades with carbon emissions as one of their variables. Based on that modeling, it is the general consensus now that the earth is warming and human activity is playing a part and if we reduce carbon emissions, the modeling suggests that we will reduce our impact to global temperature increases.
I get the skepticism, but investing heavily in clean energy which will create jobs and provide a cleaner environment has very little downside (if any) even if the scientists are wrong about climate change. Not sure why so many are content to just let China dominate the renewable industry either.