Some people might like to support the WWF's Earth Hour on 28th March.  Their publicity states 'Join millions of WWF supporters worldwide.  Sign up and switch off your lights for one hour (from 8.30pm to 9.30pm) and send a powerful message to world leaders that you want positive action to halt climate change'.  You can sign up on wwf.org.uk/earthhour.  They suggest you have, for example, a candlelit party and invite Friends around to chat about the issue and raise awareness in a fun sort of way. During Earth Hour in 2008, some 50 million people in more than 370 cities and towns across the world switched off their lights; even the Eiffel Tower and the Sydney Harbour Bridge were dark for the hour.

There is some question as to whether this will, in practice, save any emissions as it is very difficult for power stations to reduce output in an economical way for one hour unless they have some idea from past experience how much the demand is going to drop by.  Maybe WWF is going to give them some idea by letting them know the numbers who have registered. However I think the main purpose of the action is to raise awareness and give WWF some figures to lobby governments with.