Earth Hour Posted onMarch 26, 20092 Comments Tomorrow night at 8.30pm switch off your lights for an hour and join a global blackout to mark Earth Hour. Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Tumblr (Opens in new window)Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)