Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green. 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
