Thanks largely in part to Al Gore, it has become nearly impossible to deny the reality of global warming. However, knowing isn’t enough; action is required in order to begin a reversal of the damage done to our planet. Most people are unaware of just how easy it is to do this.

This is the focus of Earth Hour, a now annual event which encourages businesses and consumers to turn off the power for one hour as a simple way of saving energy. The event began in Australia in 2007 and this years aims to become global. You can participate by turning off your lights, computer, TV, etc., from 8pm-9pm local time TONIGHT, March 29, 2008.

Even Google has joined in to encourage participation by symbolically “turning off the lights” on its homepage. The site also links to a page with more information on Earth Hour.

So don’t just say you care about the planet tonight. PROVE IT.