This week Ideas takes a look at a popular, bottom-up approach to combatting climate change in the UK; it's called the 10:10 Campaign. A 10% reduction in carbon footprint by 2010 is the target for over 1,500 businesses and 40,000 individuals which includes Britain's PM, Cabinet and a few hundred MP's. We also look at how onerous a task it would be to achieve in this country and what steps are being made towards it.