Once again money, greed, and profit over ride the welfare of the planet. The Grand canyon is a beautiful rarity and should be left alone for the inhabitants of this earth so they can see the beauty and learn how nature carves and shapes this wonderful world. We have similar problems here in the Black Hills of South Dakota. Dangers abide and should be of great concern towards the health of the environment. Keep public lands, public lands, so all of us can enjoy them.