The world at our feet: Reflections on Earth and its prospects
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...
Source: upenn.edu