We're handing them [young people & future generations] a climate system which is potentially out of their control. We're in an emergency: you can see what's on the horizon over the next few decades with the effects it will have on ecosystems, sea level and species extinction

There is still time to act and avoid a worsening climate but we are wasting precious time.

The greatest danger hanging over our children and grandchildren is initiation of changes that will be irreversible on any time scale that humans can imagine.

I was lucky to grow up at a time when it was not difficult for the child of a tenant farmer to make his way to the state university.

Adding CO2 to the air is like throwing another blanket on the bed.

The urgency derives from the nearness of climate tipping points.

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.