If we drive our fellow species to extinction, we will leave a far more desolate planet for our descendants than the world we inherited from our elders.

The climate dice are now loaded. Some seasons still will be cooler than the long-term average, but the perceptive person should notice that the frequency of unusually warm extremes is increasing. It is the extremes that have the most impact on people and other life on the planet.

We're running out of time.

We have known since the 1800s that carbon dioxide traps heat in the atmosphere. The right amount keeps the climate conducive to human life.

The United States did not sign Kyoto, yet its emissions are not that different from the countries that did sign it.

I have been described as the grandfather of climate change. In fact, I am just a grandfather and I do not want my grandchildren to say that grandpa understood what was happening but didn't make it clear.

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