Guy Edwardes / 2020VISION / Amphibious bistort (Polygonum amphibium) in flower on lake, Westhay SWT reserve, Somerset Levels, Somerset, England, UK, June 2011. Photographer quote: 'This was the best display of amphibious bistort...

Bryan and Cherry Alexander / Small avalanche tracks down the walls of a valley glacier, the snow has become unstable after the summer thaw. Magdalenefjorden. Spitsbergen, Svalbard, Norway, June 2008.

Chadden Hunter / Chadden Hunter (cameraman) and film crew filming inside 'moulins', the ice caves that drain meltwater through glaciers, Gorner Glacier, Alps, Switzerland, October 2005. Filming for the Mountains Epis...

Constantinos Petrinos / Soil erosion on hillsides due to deforestation and overgrazing, Nympheon Mountains, Northern Greece

Constantinos Petrinos / Soil erosion on hillside due to deforestation and overgrazing, Nympheon Mountains, Northern Greece

Staffan Widstrand / Cramped hillside terraced housing on stilts, Manaus, Brazil, South America

Ian Lockwood / Jhuum - slash & burn cultivation of land for crop planting or cattle grazing, Garo Hills near Williamnagar, Meghalya, India

Jabruson / Thomson's gazelle newborn attempting to stand {Gazella thomsoni} Serengeti NP, Tanzania