Earth Hour is a worldwide movement for the planet organized by the World Wide Fund for Nature . It's an annual event which encourages individuals, communities, households and businesses to turn off their non-essential lights for an hour, from 8:30 to 9:30 p.m. on the last Saturday in March, as a symbol for their commitment to the planet. It originated in Sydney and has grown to engage more than 7000 cities and towns worldwide. I got in on the action by having a lovely quiet Saturday night with the lights, TV and various other screens turned off (aside from the time its taking me to do this post!). Reading by candlelight/torchlight is a rather relaxing way to spend some time. Do you take part in this event in your cities?