Earth Hour invites one billion people in more than 2800 cities representing 83 countries to turn off their lights for one hour ¨C tonight, Saturday, March 28 from 8:30pm to 9:30pm in their local time zone. On this day, cities around the world, including Paris, Sydney, London, Cairo, New York, Los Angeles and Cape Town, will join together to demonstrate their commitment to energy conservation and sustainability. Here's how you can participate:

All you have to do to Vote Earth is turn your lights out for one hour tonight, Saturday, March 28 from 8:30pm to 9:30pm local time, in your city. Your light switch is your vote!
Set your computer's power management and save up to $60 on your electricity bill and nearly half a ton of C02 over the next twelve months. Climate Savers Computing Initiative provides instructions on how you can save electricity all year long through efficient computing.
Join Earth Connect and share your opinions about climate change through blogs, e-mails, and Twitter. The goal is to gather one billion words to present at the United Nations Climate Change Conference in Copenhagen in December.
If you are affiliated with a college, help your university reduce its environmental impact by adopting green computing practices. Pledge to Power Down for the Planet and create a video to teach others about the importance of energy efficient computing in the fight against climate change.
Earth Hour is about more than dimming lights for sixty minutes; it¡¯s about making a commitment to reduce energy consumption throughout the year. As Google's business grows, we want to make sure we minimize our impact on the Earth's climate through responsible environmental practices every hour, every day.