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The world at our feet: Reflections on Earth and its prospects Humans have known for a long time that there was more than the earth beneath our feet that there was, in fact, a big-e Earth but it took a while before we figured out our place in relation to the sun and stars. Then space travel allowed us to see our whole home, surrounded by dark nothingness. Image: Mariya Pilipenko We have learned that we can change the Earth in major ways unintentionally and unpredictably. Two centuries ago the deforestation of the east coast of the U.S. resulted in sediments washing down to fill the flood plains of rivers and the creation of coastal marshes. On the other hand, dams and reservoirs are holding back so much dirt that the Mississippi delta is now starved of sediment. At this point, human activity has added billions of tons of carbon to the atmosphere, raised global temperatures and sea levels, and increased the acidity of the ocean. ....