Talking nice about sun and wind and green jobs is just greenwash.

The climate is nearing tipping points. Changes are beginning to appear and there is a potential for explosive changes, effects that would be irreversible, if we do not rapidly slow fossil-fuel emissions over the next few decades.

The fact is fossil fuel carbon will stay in the surface climate system for millennia.

The climate system is being pushed hard enough that change will become obvious to the man in the street in the next decade.

A level of no more than 350 ppm is still feasible, with the help of reforestation and improved agricultural practices, but just barely - time is running out.

The question is not whether to close the parks, but how to accomplish this goal.

The last time the world was three degrees warmer than today-which is what we expect later this century-sea levels were 25m higher. So that is what we can look forward to if we don't act soon.