NASA climate scientists provide straightforward answers to audience-submitted climate change questions.

CO2 AND TEMPERATURE

Is there any merit to the studies that show that historical CO2 levels lag behind temperature, and not lead them?

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FOOD PRODUCTION

Will climate change drastically reduce our food production, or will it change what we produce?

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GLOBAL WARMING SPEED UP?

Does the scientific community feel that global warming is decreasing or increasing?

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EXTREME WEATHER AND GLOBAL WARMING

Is the frequency of extreme weather events a sign that global warming is gaining pace and exceeding predictions?

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CLIMATE CHANGE AND HUMANS

How does climate change affect humans?