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More speculation, give me numbers in this format: Humans burn fossil fuels and increase the CO2 by x ppm; this causes exactly y to happen.This is completely irrelevant with regards to the actual problem. The problem is the change caused by altering CO2 levels, not by CO2 levels themselves. A world with higher CO2 levels isn't necessarily a problem in of itself, its all the things that come along with it - radical changes to the climate, rising sea levels, changes in which parts of the earth can support large scale farming etc. If the CO2 levels had been
If sea levels had been 50 feet higher for the past million years, it wouldn't be an issue because humans would have settled where the beach lies with those sea levels. The sea level rising now is a problem, because it would require hundreds of millions of people to move, and would involve the loss of trillions of dollars worth of human infrastructure.
And, nowhere did you 'show' that the impact of fossil fuels burning is speculation - at least with regards to the big picture, at this point it is well established and settled science.
It's stupid. According to you: Humans need to decrease the amount that they are increasing atmospheric CO2. How much? Irrelevant!