© Michael Stifter; mit frdl. Gen. von Miriam Knörnschild

© Sean Pavone / Getty Images / iStock

© NASA Earth Observatory, Joshua Stevens and Jeff Schmaltz / Gains at Hofsjökull Ice Cap

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© Amalia Villafañe

© Philip Dulian / picture alliance/ dpa

© Julien Benoit, University of the Witwatersrand

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© Schachtanlage Asse / dpa / picture alliance

©

© EnginKorkmaz / Getty Images / iStock

© Galeanu Mihai / Getty Images / iStock

© Chernobyl Radiation and Ecological Biosphere Reserve

© Stefan Rotter / Getty Images / iStock

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© Pacifique Kiwele

© NASA Earth Observatory, Robert Simmon / Night Lights 2012 Map

© Timo Metz

© Alfred-Wegener-Institut / Christian Haas

© Martin Barraud / Getty Images / OJO Images