Last year on March 31st, the city of Sidney, Australia turned off its lights for an hour. According to their website, this reduced Sidney’s energy consumption by 10.2% for an hour, or the equivalent of 48 000 cars being taken off the roads for one year.

This year, on March 29th, there’s a big campaign to get cities, companies and individuals to commit to turning off the lights for an hour at 8pm local time. The list of cities includes Ottawa, Toronto, Tel Aviv, and San Francisco to name a few. I couldn’t find Las Vegas, a city with millions of lights on the list. Hopefully they’ll be able to convince them to sign up because that’s one city in particular that could make a big difference if they turned off their signs for an hour.