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Global warming isn't a science problem. It's a political problem. We're not delaying action on climate change because we don't know what causes it. We're not stalling because we don't know what to do.

Redefining "renewable energy" is vital for protecting forests, communities and climate.

The oil and gas industry is what it is today thanks in large part to decades of federal support, and America's new and "bright" shale gas-rich future is no exception.

Europe may not be dealing with freak weather events at the moment, but in economic and social terms the storm clouds over the continent have become a permanent feature on the landscape -- for at least the past three years now -- and the hard rain is now falling, in bucket loads.

Now that the election is over, what steps can the president and new Congress take to ensure our nation's ongoing clean-energy leadership? Here are five actions for Mr. Obama that, if implemented, we believe would supercharge the U.S.'s clean-tech economy.

A gallon of gas weighs about six pounds and contains about 130 million Joules (130,000 kilojoules) or about 30,000 calories. So here are some candy-to-gasoline equivalents.

If we can identify which members of Congress attended certain meetings, we can ask them about their interest in cutting wasteful fossil fuel subsidies first, given they are far larger than the cost of policies that support the growth of new clean energy sources.

Solar, wind, oil, and gas all provide us energy and electrons, so the debate needs to be about all sources of energy, or none.

How can world leaders at the Rio+20 Earth Summit next week show that they are serious about sustainable development and environmental protection? The answer is simple: end fossil fuel subsidies.

Americans have traditionally loved sweet things. Think about it. You can't get any more American than a sweet slice of apple pie.

President Obama, we get that you're concerned about the US losing its competitive advantage in relation to new powerhouses such as China, Brazil and India, but how can you look us in the eye and say that any level of poverty is okay?

The key to calming these waters is not lurching from extension to extension of subsidy programs, but rather smart policy reform. We need a system that will sustain clean energy growth and maintain U.S. leadership in this highly competitive market.