The big problem with Global warming is that it's a feedback loop. The main cause of warming is warming, despite the massive human CO2 production. Even stopping human CO2 production all together would slow global warming, bringing it back to 2 degrees over 1000 years or so, instead of 100. Even that would be a lot faster than the natural rate. Earth heats up, then you get an ice age, then it heats up again, that's the natural cycle.

The point of climate policy is not to stop global warming, in the sense of cooling the planet in an absolute sense. It's to slow it down, cooling it in a relative sense.