Read about one family's attempt to "go green" for a year here:
http://news.bbc.co.uk/2/hi/programme...ma/6413195.stm
The piece contains useful tips such as:
(1) Line your curtains - this'll stop draughts and save almost as much heat as double glazing your windows.
(2) Save water by flushing your loo less often and (ahem!) urinate in your compost bin.
(Story from bbc.co.uk)