Is your argument "the earth is complicated enough that nobody can ever understand it completely, so don't even bother"? Because that's a laughable attitude. Re

Is your argument "the earth is complicated enough that nobody can ever understand it completely, so don't even bother"? Because that's a laughable attitude. Regarding your exhalation comment, the specific problem is not CO2 itself. The problem is liberating CO2 from fossil-fuel sinks where it has been sequestered away from the atmosphere for millions of years.