Cath Hassell from ech2o consultants shares why saving water - particularly hot water - is something we should all be doing. She also explains how we can achieve this in our houses through a mixture of technical solutions and behaviour change.

*A lot of the information in this episode is specific to the UK. This is because it became difficult to keep answering in general world terms because in each country it would be slightly different.*

Lloyd Alter, Managing Editor of TreeHugger, explains how worldwide trends in green building have developed. He also shares his tips for self build success as well as some pitfalls to avoid.