I think humans are pretty much incapable of doing long-term science and coming to rational conclusions on any kind of climate or environmental issues. If any money is involved at all it gets politicized and science goes right out the window.

Plus, time scales of even 10 or 20 years are too long to really enter our decision making process in any meaningful way. Essentially we will do whatever we want until there is an immediate crisis, and then we will deal with it to the best of our ability. Maybe that means mass deaths or extinction, or maybe the consequences will be manageable.