Today between 9 and 10 p.m. the lights will be turned off to raise awareness of global warming. Many of London's most famous landmarks, including Buckingham Palace, Canary Wharf, the BT Tower, Harrods, the Savoy, the Ritz, the National Theatre and some government ministries will have the lights turned off.

Lighting contributes approximately 10% of the average household's electricity consumption, with an increasing amount of electricity being consumed by ever more power hungry appliances, in particular Personal Computers and Flatscreen TVs.