I will personally reach out to the leaders of the biggest carbon emitting nations.

Leadership isn't about telling people what they want to hear - it's about telling them what they need to hear.

We can't afford to wait any longer.

I will launch a Clean Technologies Venture Capital Fund that will provide $10 billion a year for five years to get the most promising clean energy technologies off the ground.

We will also explore safer ways to use nuclear power, which right now accounts for more than 70% of our non-carbon generated electricity.

When it comes to the issue that will determine the very future of life on this Earth, we are still Earth's best hope.

We will start by dramatically improving the efficiency of our buildings, which currently account for nearly half of all carbon emissions in America today.

We are still Earth's best hope.

Today I want to lay out the second part of my plan - a set of proposals that will allow America to lead the world in combating global climate change.

There's no more pressing challenge facing our country than the threat of climate change.

He's the only candidate in this race who has the ability to unite people for real change in our energy policy.

Global warming is a grave and growing threat to our national security.