We think that diamonds are very important, gold is very important, all these minerals are very important. We call them precious minerals, but they are all forms of the soil. But that part of this mineral that is on top, like it is the skin of the earth, that is the most precious of the commons. – Wangari Maathai (1940–2011), Dirt! The Movie, 2009
How can I stand on the ground every day and not feel its power? How can I live my life stepping on this stuff and not wonder at it? Science says that an acre of soil produces one horsepower every day. But you could pour gasoline all over the ground forever and never see it sprout maple trees. – William Bryant Logan, Dirt: The Ecstatic Skin of the Earth
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