Reuters: The World Wildlife Fund wants you to power down your electronic life for one full hour this weekend: no lights, no TVs, no computers — basically, nothing that actively uses electricity. Think you’re up for the Earth Hour challenge? Earth Hour: What It’s All About Earth Hour is scheduled for 8:30 to 9:30 p.m. in your local time zone this Saturday, March 28. The goal is send a message to governments everywhere that more should be done to combat climate change. Leaving your …