One of my heroes is climate scientist, James Hansen. He's been the most effective activist advocating for reduced emissions of CO2 in the world.
I'm not going to give you my take on this other than to say - read it.
"This is analagous to the issue of slavery faced by Abraham Lincoln or the issue of Nazism faced by Winston Churchill," he said. "On those kind of issues you cannot compromise. You can't say let's reduce slavery, let's find a compromise and reduce it 50% or reduce it 40%."