Pal Hermansen / Silhouette of a Blue tit (Cyanistes / Parus caeruleus) seen through the windscreen of an old car, Bastnas, Sweden, December. Winner of the Fritz Polking Prize at the GDT competition 2013 and winner of...

Philippe Clement / Lightning during thunderstorm above petrochemical industry seen through magnifying glass held against illuminated globe of the earth Digital composite

Duncan Mcewan / Frost and snow landscape, River Glass, Strathglass, Inverness-shire, UK

Nigel Cattlin / Scarlet pimpernel (Anagallis arvensis). England, UK. September.

Nigel Cattlin / Scarlet pimpernel (Anagallis arvensis) growing as arable weed. England, UK. September.

Ashley Cooper / Member of the Scottish Avalanche Information Service looks at snow crystals to help assess avalanche risk on Cairngorm in the Cairngorm National Park, Scotland, UK. March 2009

Ashley Cooper / Member of the Scottish Avalanche Information Service looks at snow crystals to help assess avalanche risk on Cairngorm in the Cairngorm National Park, Scotland, UK. March 2009

Ashley Cooper / Equipent used by the Scottish Avalanche Information Service to assess avalanche risk in the Scottish mountains, Cairngorms National Park, UK. February 2009

Ashley Cooper / Campbell Stokes Sunshine Recorder, which measures hours of sunlight at Base Orcadas, an Argentine scientific station in Laurie Island, South Orkney Islands, Antarctic Peninsula.

Paul Harcourt Davies / Venus' looking glass (Legousia speculum-veneris) a weed of cultivated land whose flowers open in fine weather. Near Norcia, Sibillini, Umbria, Italy. July.

Paul Harcourt Davies / Venus' looking glass (Legousia speculum-veneris) a weed of cultivated land whose flowers open in fine weather. Near Norcia, Sibillini, Umbria, Italy. July.

Paul Harcourt Davies / Venus' looking glass (Legousia speculum-veneris) with other weeds of cultivated land Legousia flowers open in fine weather. Nr Norcia, Sibillini, Umbria, Italy, June.