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Attendee Jairo Diaz , center, stands with a poster of Jesus Christ during the Moral Action on Climate Justice rally on the National Mall in Washington, D.C., U.S., on Thursday, Sept. 24, 2015. 'Climate change is a problem which can no longer be left to a future generation,' Pope Francis said at the White House yesterday. Photographer: Oliver Contreras/Bloomberg via Getty Images

Attendee Jairo Diaz , center, stands with a poster of Jesus Christ during the Moral Action on Climate Justice rally on the National Mall in Washington, D.C., U.S., on Thursday, Sept. 24, 2015. 'Climate change is a problem which can no longer be left to a future generation,' Pope Francis said at the White House yesterday. Photographer: Oliver Contreras/Bloomberg via Getty Images