The Mayor of London has teamed up with British Gas and B&Q to give free energy saving light bulbs to Londoners. Apparently 40% of the capital’s CO2 emissions are as a result of London’s households, so in an effort to reduce this, if you take up to two of your old light bulbs into a London branch of B&Q this weekend (Friday 11th to Sunday 13th January 2008), they’ll replace them with low energy CFL light bulbs.

If you don’t live in London, you can still reduce your CO2 emissions by switching to low energy light bulbs, and save some money on your electricity bill at the same time. Other ideas for reducing your energy usage is to close your curtains at dusk, turn down your thermostat by one degree and wear a jumper in the house, and switch off the light when you leave a room.