Ashley Cooper / The Brockholes visitor centre at the Lancashire Wildlife Trust reserve in Preston, Lancashire, UK. The Brockholes reserve is a wetland habitat constructed from old gravel pit workings. The green visit...

Markus Varesvuo / House Bunting (Emberiza sahari) female and male perched on ventilation ledges in building, Morocco, February

Pat Tuson / Compost toilet or lavatory with ventilation pipe showing at rear, Alexandra Palace Allotments, London Borough of Haringey, UK, September 2013.

Pat Tuson / Compost toilet or lavatory with ventilation pipe showing at rear, Alexandra Palace Allotments, London Borough of Haringey, UK, June 2013.

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with cowls which incorporates a passive ventilation system on the green roof. The Horniman Museum, London, England UK, October 2008

Pat Tuson / Green roof on The Centre for Understanding the Environment (CUE) an eco building with cowls on the roof which incorporate a passive ventilation system. The Horniman Museum, London, UK

Pat Tuson / A Cowl which incorporates a passive ventilation system on the roof of the Centre for the Environment at the Horniman Museum, Forest Hill, London, UK

Pat Tuson / A Cowl which incorporates a passive ventilation system on the roof of the Centre for the Environment, Horniman Museum, London, UK

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with cowls which incorporate a passive ventilation system on the roof. The Horniman Museum London, UK

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with showing cowls which incorporate a passive ventilation system. The Horniman Museum London, UK

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with cowls which incorporate a passive ventilation system on the green roof. The Horniman Museum London UK

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with cowls which incorporate a passive ventilation system on the green roof. The Horniman Museum London UK

Pat Tuson / The Centre for Understanding the Environment (CUE) an eco building with cowls which incorporate a passive ventilation system on the green roof. The Horniman Museum London, UK

Bryan and Cherry Alexander / Chukchi woman looking through ventilation hole of tent. Chukotskiy Peninsula, Chukotka, Siberia, Russia, spring 2010

Jane Burton / Border Collie bitch in posed picture to show hot dog in a hot car - the window open a slit is not sufficent ventilation

Rick Tomlinson / Mast reflects in the shiny, new dorades on the deck of 180ft superyacht "Adele". ^^^180 foot Andre Hoek designed ketch, built by Viitters Shipyard in Holland.

Doug Gimesy / Domestic pigeons (Columba livia) sitting on a roof preening while one bird spins on a whirlybird air vent as it rotates, Australia.