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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.

There is an urgent need to stop subsidizing the fossil fuel industry, dramatically reduce wasted energy, and significantly shift our power supplies from oil, coal, and natural gas to wind, solar, geothermal, and other renewable energy sources.

New discoveries and production of resources like shale oil and gas are dramatically altering our energy supply outlook and the entire global geopolitical landscape. And the pace of change - particularly in the past few years - continues to accelerate.

I think that the world is in the middle of a huge transition that we have to make to renewable energy. We have to transition away from fossil fuels very, very quickly.

However, it may occur that we will find ourselves using a variety of fuel sources to give us the energy we need support our lifestyles and boost our economy.

I think the cost of energy will come down when we make this transition to renewable energy.

When it comes to fossil fuels, we're going to find more here and use less. Over time, we're going to become energy independent. I am tired of sending $300 billion overseas to buy oil from people who hate our guts. The choice between a weak economy and a strong environment is a false choice, that is not the choice I'll offer America.

Even as we work to develop more sources of petroleum for the United States, we must continue our vigorous pursuit of alternative fuels, so that we can be powered by cleaner, more efficient sources of energy.

The more energy-efficient we become as a nation, the less we need to develop additional energy sources.

What we are investing in, from a generation standpoint, are renewables and natural gas.