Participate in Earth Hour

www.earthhour.org
On March 29th from 8-9pm everywhere in the world, people participating in Earth Hour will turn off their lights, TV, dishwasher, heating/ac, etc.
"Last year, on 31 March 2007, 2.2 million people and 2100 Sydney (Australia) businesses turned off their lights for one hour – Earth Hour. This massive collective effort reduced Sydney’s energy consumption by 10.2% for one hour, which is the equivalent effect of taking 48,000 cars off the road for one hour."
It's just an hour and its a demonstration of the potential we have to make up for the harm we impose on the planet.
And I'm sure you can think of something to do in the dark for an hour...