Melanie Martinez holds the family cat, which she renamed Isaac, after salvaging items from her flooded home. 2012. Source: Mario Tama, Getty.

Robert Kofi Bamfo, Corporate Manager, Forestry Commission, Ghana, at the 2005 UN Climate Conference in Montreal. Source: Joel Sternfeld, When it Changed

Environmental activists march in downtown Pittsburgh, July 31, 2014. Source: AP photo/Gene J. Puskar

Roy Alexander fixing new road sign signaling the UK’s first carbon neutral village, Ashton Hayes in Cheshire. January 2006. Source: Ashton Hayes Going Carbon Neutral photo gallery.

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