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We must reduce all the emissions that are destroying the planet. However, that requires a change in lifestyle, a change in the economic model: We must go from capitalism to socialism.

We have to slow down the emissions of carbon dioxide and methane from coal burning, oil and eventually natural gas... And the best ways to do that are energy efficiency and a switch to renewables.

I think we can lower our emissions. I think the world will be better off if we did that, and we can do it without cap and trade.

We waste an awful lot of energy as a Nation through inefficient use of energy.

As with any difficult challenge that the public and policymakers face, there is no single solution or silver bullet that will serve as the answer to how the United States works to reduce carbon emissions.

We run enormous risks and we know what kind of reductions of greenhouse gases are necessary to drastically reduce risks. Reducing emissions by half by 2050 is roughly in the right ballpark. It would bring us below 550 ppm.

The struggle against poverty in the world and the challenge of cutting wealthy country emissions all has a single, very simple solution... Here it is: Put a price on carbon.

Instead of hazarding our future on the dirty fuels of the past, let's invest in clean power that can drive this country forward. Let's cut energy waste, make our economy the world's most efficient, and give our workers a leg up in the global marketplace.

The infrastructure, institutions and social fabric of Venezuela are deteriorating, and people realize the Chavez government has been the problem, not the solution.