NASA Administrator Charles Bolden, left, is seen on stage with during the Global Citizen 2015 Earth Day event on Saturday, April 18, 2015 on the Washington Monument Grounds in Washington, DC. Administrator Bolden and highlighted how the agency is using space based sensing to better understand how our planet works, how we affect it, and how it might change in the future.

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Keywords: .., 2015, bolden, charles, citizen, day, dc, earth, global, joel, kowsky, launch, mall, nasa, national, rocket, space, washington