Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) resting on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Guy Edwardes / 2020VISION / Giant horsetail (Equisetum telmateia), Catcott Lows SWT reserve, Somerset Levels, England, UK, April. 2020VISION Book Plate. Did you know? Horsetails can grow to over two metres tall.

Bryan and Cherry Alexander / Drygalski Glacier, which receded 300 metres between November 2008 and 2009, South Georgia, 2009.

Alex Hyde / Dwarf snowbell (Soldanella pusilla) flower in snow. The plant generates heat by fermenting sugars to melt the surrounding snow. Austrian Alps, 2300 metres above sea level, June.

Alan Watson / Montane rainforest canopy and clouds at 1,200 metres, Ranomafana National Park, Madagascar January 2009

Alan Watson / Frond pattern of tree ferns (Cyathea arborea) in lowland tropical rainforest at 420 metres, Loma Quita Espuela Scientific Reserve, Dominican Republic.

Alan Watson / Frond pattern of tree ferns (Cyathea arborea) in lowland tropical rainforest at 420 metres, Loma Quita Espuela Scientific Reserve, Dominican Republic.

Benoit Stichelbaut / Waves crashing around Ar-Men Lighthouse (37 metres) in the Sein channel, Finistère, Brittany, France. December 2007.

Benoit Stichelbaut / Waves crashing around Ar-Men Lighthouse (37 metres) in the Sein channel, Finistre, Brittany, France. December 2007.

Chadden Hunter / Dallol hot springs where water heated by magma laden with potassium, sulphur and iron spews up through salt pans staining the salt deposits with vivid colours, in the bottom of the Rift Valley, 120 me...

Pete Oxford / Sol de Manana fumeroles geothermal activity at 4850 metres Altiplano, SW Bolivia

Asgeir Helgestad / Climber on Mt Galdhopiggen, 2468 metres, Jotunheimen NP, highest point in Norway