As we thicken the layer of greenhouse gases, more of the outgoing heat is trapped, and the temperature increases.

We need more than just a policy shift; we need a transformation in public-policy thinking to embrace the reality of what science is telling us.

After years of being the last place on Earth to get serious about our climate, this is our moment.

We're borrowing money from China to buy oil from the Persian Gulf to burn it in ways that destroy the planet.

I do believe that a revenue-neutral CO2 tax is the simplest and best way to proceed.

The droughts in the Southeast and in the West are getting longer and deeper, and are related to global warming.

Climate change will be increasingly central to our foreign policy and our national security.

This is a moment of enormous opportunity for new technology, new jobs, for the greening and transformation of our economy.

The solutions to the climate crisis are the very same solutions that will address our economic and national security crises as well.

if we set our minds to it, we could, in this country, produce 100 percent of our electricity from renewable and carbon-free sources within 10 years.

the risk of the collapse of the basis for civilization, as we know it.

the predictions, that floods, droughts, hurricane damage, fires, and other climate-related disasters will increase even more dramatically the longer we delay action on this, the cost is quite serious.

Our home--Earth--is in grave danger.

If Congress acts right away to pass President Obama's Recovery package and then takes decisive action this year to institute a cap-and-trade system for CO2 emissions...

the effort to combat global poverty and to feed those who are hungry is harshly impacted by the impact of global warming.

The very fact that developing countries, like Brazil and Indonesia, China, which is in its own category, have now begun to take initiatives--I think that makes it a very different situation.

We negotiated the Montreal Protocol, more than 20 years ago, to protect the ozone layer.

As long as we continue to send hundreds of billions of dollars for foreign oil... our national security will continue to be at risk.

I urge this Congress to quickly pass the entirety of President Obama's Recovery package.

How can we afford not to do this?

I think, for our country, the road to Copenhagen is to pass the green stimulus measures now pending, pass the cap-and-trade legislation this year;

most GMOs turn out to be no different in their impact on the environment than the long, slow process of seed selection.

This is, properly understood, a planetary emergency.

making this transition is one of the best and most effective ways to create good, new, sustainable jobs quickly.

As a rule of thumb, the amount of carbon now sequestered in trees and forests around the world is roughly equal to twice the amount that is in the atmosphere.