NASA scientists examine the Earth's climate and how it is changing – gaining knowledge (or insight?) through decades of satellite observations, powerful computer models and expert scientific analysis.
Over the course of September 2013, these NASA climate experts will answer selected questions through the agency's social media channels – primarily on YouTube, Twitter and Google+.
But first – we need your questions.
Have a question that's always confounded you about Earth's climate? Wonder why it matters that the climate is changing now if it has changed before? Or how scientists know changes seen in recent decades are the result of human activities, not natural causes?
Go ahead. Ask a climate scientist.