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How clean is green hydrogen?

What makes methane a more potent greenhouse gas than carbon dioxide?

How long will it take temperatures to stop rising, or return to ‘normal,’ if we stop emitting greenhouse gases?

How many wind turbines would it take to equal the energy output of one typical nuclear reactor?

How should we measure the CO2 emissions from biofuels and bioenergy?

How do we know how long carbon dioxide remains in the atmosphere?

Is today's climate change similar to the natural warming between ice ages?

How is lithium mined?

Does the carbon dioxide that humans breathe out contribute to climate change?

If the U.S. limits fossil fuel production at home, will we turn to cleaner sources of energy, or just import more oil and gas?

Does global warming affect the coldest days or the hottest days more?

If a fossil fuel power plant uses carbon capture and storage, what percent of the energy it makes goes to the CCS equipment?

What are the biggest challenges and innovations for new climate models?

How much do government subsidies affect the price of fossil fuel energy? How about renewable energy?

How do we know how much CO2 was in the atmosphere hundreds of years ago?

What is "clean energy"? Is any kind of energy completely clean?

Does harvesting wood contribute to climate change even if the wood is used for permanent structures like houses?

What does lowering the United States’ greenhouse gas emissions accomplish for climate change, if most emissions come from other countries?

How do clouds affect the Earth's temperature? Are humans changing clouds?

What are the best- and worst-case scenarios for sea level rise?