Adrian Davies / Insect hotel / Artificial nest holes and shelter for insects and invertebrates, in garden, England, UK, August 2010

Adrian Davies / Insect hotel / Artificial nest holes and shelter for insects and invertebrates, in garden, England, UK, August 2010

Ashley Cooper / Triple glazed windows in old farmhouse refurbished to be as environmentally friendly as possible. Grayrigg, Cumbria, England, UK, April 2012.

Ashley Cooper / Triple glazed windows in old farmhouse refurbished to be as environmentally friendly as possible. Grayrigg, Cumbria, England, UK, April 2012.

Ashley Cooper / Insulation in old farmhouse refurbished to be as environmentally friendly as possible. Grayrigg, Cumbria, England, UK, April 2012.

Ashley Cooper / Environmentally friendly house that was built in the 1970's but still exceeds green build regulation today, at Feshiebridge, Cairngorm, Scotland, UK, March 2012.

Ashley Cooper / Environmentally friendly house that was built in the 1970's but still exceeds green build regulation today, at Feshiebridge, Cairngorm, Scotland, UK, March 2012.

Ashley Cooper / The Green building, an environmentally friendly mixed use development next to Oxford Road Railway Station, Manchester, England, UK, November.

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...

Ashley Cooper / Visitor centre at Cley Nature Reserve on the North Norfolk coast, An environmentally friendly building with a green roof, grey water harvesting, a wind turbine, solar thermal water heating and a groun...

Ashley Cooper / Visitor centre at Cley Nature Reserve on the North Norfolk coast, An environmentally friendly building with a green roof, grey water harvesting, a wind turbine, solar thermal water heating and a groun...

Pat Tuson / Environmentally friendly household cleaning products on kitchen work surface. London, UK

Pascal Tordeux / Vertical axis wind turbine charging an electric car, France, May 2013.

Pascal Tordeux / View inside a bank of electricity producing engines running on methane, part of a biogas plant, Spain, January, 2013.

Pascal Tordeux / Mainframe used for the central controlling and monitoring of the process of anaerobic digestion in a cattle farm, Spain, January 2013.

Pascal Tordeux / Methane recovery apparatus, part of the biogas production process, Spain, January, 2013.

Pascal Tordeux / Tarpaulin bags containing methane inflating on a concrete slab, part of a biogas production process, Spain, January 2013.

Pascal Tordeux / Spirulina (Arthrospira) cultivation in heated greenhouses, using waste hot water from a biogas production process, Spain, January, 2013.

Pascal Tordeux / Spirulina (Arthrospira) cultivation in heated greenhouses, using waste hot water from a biogas production process, Spain, January, 2013.

Pascal Tordeux / Panoramic view of two anaerobic digesters in a biogas plant, Spain, January, 2013.

Pascal Tordeux / View of an anaerobic digester in a biogas plant, Spain, January, 2013.

Pascal Tordeux / Vertical filters in a biogas plant used to separate methane from carbon dioxide, water and oxygen, Spain January 2013

Pascal Tordeux / Information panel explaining the process involved in producing biogas and its different uses, Spain, January 2013.

Pascal Tordeux / A pile of digestate, a waste product in the biogas production process, used as an organic soil improver, with a Biogas plant in the background, Spain, January 2013.

Sandesh Kadur / Growing shade Coffee (Coffea genus) can be more environmentally friendly than the monocultural practice of growing tea. Although the flowers last only a few days, the berries take nearly nine months t...

Sandesh Kadur / Coffee (Coffea genus) plants flowering, Western Ghats, India. Growing shade coffee can be more environmentally friendly than the monocultural practice of growing tea.

Nick Turner / Environmentally friendly Bio washing-up liquid refill information label, September 2008.

Eric Baccega / Blachford Lake Lodge, an environmentally friendly and remote fly-in lodge, and man on skidoo, Northwest Territories, Canada. March 2007