Gerrit Vyn / Jonah natural gas field south of Pinedale, Wyoming.

Bryan and Cherry Alexander / Sundogs (parhelia / parhelai) behind a 'Christmas tree' (valve assembly) in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A gas drilling derrick at sunset in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / Grisha (right) and Gosha Vanuitto, Nenets reindeer herders, at their winter camp on the tundra in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A 'Christmas tree' (valve assembly) in front of a gas drilling derrick in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / Oil storage tanks near Sabetta, South Tambey Gas field, Yamal, Siberia, Russia. February 2014.

Adrian Davies / Anti-fracking protest, sign attached to hedge, Balcombe, West Sussex, England. 19th August 2013.

Wild Wonders of Europe / Grunewald / Sulphurous fumaroles (solfatara) Vulcano Island, Italy, May 2009

Wild Wonders of Europe / Grunewald / Sulphuric gases coming out of a fumarole (solfatara) Vulcano, Aeolian Islands, Italy, May 2009

Pete Oxford / Sulphur fulmerole in crater of active volcano, Sierra Negra, Isabela Is, Galapagos

Jabruson / Volcanic eruption , Kimanura volcano, Virunga NP, Democratic Republic of Congo.

David Woodfall / Water vapour and waste gases from gas central heating in house.