Waterways become cleaner over time from "summary" of The World Without Us by Alan Weisman
Without constant human interference, nature has an impressive ability to heal itself. Take, for example, the waterways that crisscross our planet. When we envision a world without us, we see rivers and streams gradually returning to a state of cleanliness. Over time, without pollutants being dumped into them or dams blocking their flow, these waterways can undergo a remarkable transformation. As industrial activities cease and toxic chemicals are no longer introduced into the environment, aquatic ecosystems are given the opportunity to recover. The delicate balance of life in rivers and lakes can be restored, with plants and animals flourishing once again. Without the constant threat of contamination, fish populations can rebound, and the water itself can become clearer as sediment settles and pollutants break down naturally. In the a...
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