At this year's Door Opener Day, lots of exciting questions were asked by our visitors. Here, we answer one of them. Lakes, rivers, and streams provide habitats for countless animal and plant species, supply drinking water, and offer great enjoyment for fishing, boating, swimming, and walking. But many bodies of water are under pressure: pollution, water scarcity, climate change, and human interference are taking their toll. The good news is that everyone can help protect our waterways—often through simple actions in everyday life.