Will Anderson is a researcher and writer with wide interests in the environmental field. At the turn of the century he left a long-standing career in public health to gain a degree in Energy and Sustainable Development, a first step in his personal journey to address the challenge of climate change. He subsequently built ‘Tree House’ in Clapham, one of Britain’s few genuinely ‘zero carbon’ houses and the subject of his book Diary of an Eco-Builder. Will is now Senior Researcher at the Centre for Sustainable Energy, www.cse.org.uk. His website is www.treehouseclapham.org.uk .