The authors say they had to consider the implications for energy policy following a report from the Royal Commission on Environmental Pollution.

BBC: Wind turbines

Sir John is a former head of the UK Meteorological Office, former chairman of the Royal Commission on Environmental Pollution, and co-chaired one of the Intergovernmental Panel on Climate Change (IPCC) working groups.

BBC: Man with dead camel in desert. Image: Jim Loring/Tearfund