Doesn Mother Nature purify water on her own?
Yes. As rain trickles through the ground, it does become cleaner. Wetlands also help remove impurities. Unfortunately, wetlands are being diminished. Gas stations, shopping malls, grazing, mining, oil exploration, forestry; all impair nature’s ability to purify water. Some large sources of water have become reservoirs for pollution. This occurs as sediments in rivers and lakes retain toxic chemicals from years gone by, and as they absorb new chemicals being dumped. Large bodies of water can absorb pollution from the air when particulate matter in rain and snow is deposited in them. The Great Lakes may have acquired as much as half of their pollutants from aerial sources.
