Tonight, from 8 to 9 in your own time zone, turn off your lights. And your tv. And your video games.

Go dark for an hour.

For the second year in a row, individuals, businesses, and governments around the globe are cutting back on their power usage to demonstrate the effectiveness of group conservation efforts.

From the Earth Hour website:

The aim of the campaign is to express that individual action on a mass scale can help change our planet for the better.

The event itself will clearly demonstrate in participating cities, the connection between energy usage and climate change, showing that we as broader community can address the biggest threat our planet has ever faced.

Not sure what to do for that hour? Here are some suggestions:

• Take a walk around your neighborhood
• Talk to your neighbors
• Tell ghost stories
• Eat dinner by candlelight
• Cuddle with your kids or with your significant other
• Knit or crochet or do some other handicraft that you can do by touch

And, of course, try to take the power of the lesson — that we easily can make a difference — and try to be more energy efficient in the hours and days that follow.