Per the below report by Morgan Stanley, it will cost $50 Trillion to stop global warming by 2050.
Is that a big number?
Well, the current estimate of World GDP is roughly $80 Trillion/year. This is expected to double, to $160 Trillion by 2050.
Therefore, over the 30 years, the $50 Trillion to stop global warming equates to roughly 0.014 of world GDP.
By itself, $50 Trillion is a very big number. But, spread over 30 years, and all the world economies, it is a very small and achievable number.