At Inhabitat, every day is Earth Day. We work each and every day to bring the latest news on the many exciting ways to inhabit the Earth in a smarter, greener, more sustainable way. So while Earth Day may have an element of business as usual, it's also a great time to take stock of the world's most important environmental issues. Studies frequently cite the dark future the planet will face if we do not change our our habits and activities on every imaginable level. The Organization for Economic Cooperation and Development referred to the environmental outlook of the planet as, quite simply, "grim." So this Earth Day, we're considering the most important environmental issues, and a few of the steps we can take to create a healthier future for ourselves, our communities and of course, the Earth.