According to 'Feeling the heat', published on 20 October by development charity Tearfund, there are 25m "environmental migrants" in the world, who have fled such events as sea level rises, flooding, poor harvests and drought.

The report, citing examples from Mexico, Brazil, China and Nigeria, suggests that 200m people could be migrating in search of water supplies by 2050, unless urgent action is taken to tackle climate change.

Climate Journalist George Monibot has written 'Heat: how to stop the planet burning', a book published by Penguin that sets out the lifestyle changes that people need to make in order to reduce their contribution to global warming. The book is accompanied by the website that sets out to expose "false environmental claims" and so called "greenwash" by companies and celebrities.