Great comment I mostly agree. However, the effects of climate change are done with simulations that are just continually adjusted until they get the result they want or else they lose funding.
If you read the sceptical environmentalist it makes the solid case with long term data that shows every aspect of the environment is getting better except for global warming. But it also shows the harm from climate change is much lower than people predict and mostly effects poor people on coast lines and barely fertile land. It also happens slowly over 100 years where future tech will drastically reduce harm. Additionally the large majority of the damage to the air was done during the industrial revolution, so cutting back on co2 emissions will have negligible consequence. Basically he proves that of the top 20 most harmful things to humanity, it is the worst use of money and putting any significant money into stopping climate change is a waste. For every life saved by cutting emissions hundreds could be saved by investing in other problems like mosquito nets. Bill gates knows where to invest in humanity.