Happy Earth Day! In honor of Earth Week, this week we took a moment to think about the origins of this now-global event, exploring why we need Earth Day and how our society can possibly tackle the 7 biggest threats to our environment. If haven't yet made plans for Earth day make sure to take a look at our list of 10 Earth Day activities. One of the major themes of Earth Week this year was lighting, as green lighting innovations ranging from the useful to the absurd made it onto Inhabitat's radar screen. On the more practical end of the spectrum, we reviewed the SUNNAN, Ikea's solar-powered desk lamp, and although we found it to be a bit dim, it actually outperformed its expected charge time. On the lighter side, Randy Sarafan, the same guy who designed a chair that tweets his own farts (seriously), unveiled a lamp that shuts off whenever you shut your eyes. The downside: In order for it to work you have to attach electrodes to your face, which are plugged directly into the wall. Thanks, but we'll pass. And for those who prefer regular, old-fashioned lights, Philips launched its much-anticipated L-Prize winning 10-watt LED bulb on Earth Day. At $60 a pop, you might have to take out a second mortgage to replace every bulb in your home, but you'll recoup that money back on your energy bill, and Philips also announced some rebates to ease the pain.

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Inhabitat's Week in Green: ten earth activities, transnatural stools and wood ash bike frames originally appeared on Engadget on Sun, 22 Apr 2012 20:30:00 EDT. Please see our terms for use of feeds.