Ashley Cooper / Rotting tree stump in forest in Johnsons Canyon in the Banff National Park, Canadian Rockies, Canada, August 2012.

Ashley Cooper / Sign saying recycled water in use at the Bluescope steel works in Port Kembla, Wollongong, New South Wales, Australia. February 2010.

Ashley Cooper / Emissions from Waternet, a water business that takes sewage from Amsterdam and converts it back into drinking water, Amsterdam, Netherlands. May 2013

Ashley Cooper / Food waste collection truck in London, UK, which will take the waste to a bio-digester plant to create bio-gas.

Ashley Cooper / Greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK.

Ashley Cooper / Greenhouse made from waste plastic drinks bottles in the community garden at Mount Pleasant Ecological Park, Porthtowan, Cornwall, UK. September 2013.

Ashley Cooper / Bedzed the UK's largest eco carbon neutral housing complex in Beddington, London, UK, May 2007.

Adrian Davies / Recycling bin for food waste. Surrey, England, UK. January.

Adrian Davies / Waste plastic in green recycling bin. Surrey, England, UK. December.

Huw Cordey / Pathway made of plastic shoes ( flip flops) washed up on the beach and collected within 20 metres of the middle of the picture. In the background is a Aldabra giant tortoise (Aldabrachelys gigantea)...

Five Films / Crane lifting a bag filled with collected marine plastic for recycling onto a boat, Svalbard, Norway, August 2017.

Tom Gilks / Water filled bottle fixed into a tin roof, dispersing sunlight and acting as a natural lightbulb. Kenya. April 2013.