We are on the precipice of climate system tipping points beyond which there is no redemption.

We have to, in the next ten years, begin to decrease the rate of carbon dioxide emissions and then flatten it out. If that doesn't happen in ten years, we're going to be passing certain tipping points. If the ice sheets begin to disintegrate, what can you do about it? You can't tie a rope around an ice sheet.

I think we have a very brief window of opportunity to deal with climate change. No longer than a decade at most.

The scientific excitement in comparing theory with data, and developing some understanding of global changes that are occurring, is what makes all the other stuff worth it.

As you get more global warming, you should see an increase in the extremes of the hydrological cycle - droughts and floods and heavy precipitation.

The forcings that drive long-term climate change are not known with an accuracy sufficient to define future climate change.

Money has too big an influence on our politics in Washington and somehow we need to do something about that.