I recognize this. There are different answers for different people, too. The people of the Maldives want the temperature rise regulated below 1.5 C. Certain environmentalists want atmospheric CO2 at pre-industrial levels. Perhaps Alaskans have a different view?<p>The point is that this is how to structure the debate. There are certain acceptable limits. They are different for every person. If we're to succeed, as a species, on a finite planet, we're going to need to figure out how to make democracy and diplomacy work for this, possibly grandest tragedy of the commons. Surely we can't risk a global temperature rise of 10 C? Right?