I have always been fascinated with those who try to look over the horizon and see things that are coming at us.

I've learned the importance of changing people's minds at the grassroots level so that whoever does run will have a much better chance of encountering public opinion that reaches a critical mass and brings about a change not only in White House policies but in the Congress and in the state legislatures and all around the world.

The signs that the world is spinning out of kilter are increasingly difficult to misinterpret. The question is how to convince enough people to join a critical mass of urgent opinion, in the U.S. and the rest of the world.

CO2 is the exhaling breath of our civilization, literally... Changing that pattern requires a scope, a scale, a speed of change that is beyond what we have done in the past.

Environmental quality was drastically improved while economic activity grew by the simple expedient of removing lead from gasoline - which prevented it from entering the environment.

Comprehensive climate legislation must be passed so that we can ensure a world where this and future generations can experience the bliss of breathing clean crisp air, while fishing in the Adirondacks... and being able to eat the fish afterwards.

By withdrawing from the Paris Agreement, the U.S. cedes power and influence to our rivals. If we retreat on our promises and cede leadership on climate issues, we lose credibility. Further, we lose the ability to hold other countries accountable for a broader range of issues.

I believe in climate change.