Everytime you turn on a light, the electricity required may have come from a hydroelectric dam that is blocking fish migration, or a fossil fuel generator which is producing acid rain emissions that will settle on our rivers making the water too acidic to sustain life. Maybe the tomato on your plate came from a farm that has cut away all the trees from a stream bank to create more room to grow food. As a result, the stream is left exposed to the direct sun and when it rains, silt from the farmers field clogs the stream bed. Or his fertilizer runs off the land and into the river resulting in poor water quality. Or maybe the farmer has installed a system of drainage pipes in his field to move water off more quickly.
Faster drainage means increased stream water speeds leading to erosion.
Maybe if they let the water sink into the ground, it would be slowly released into the river and we would have much better water levels all year round. Clearcuts cause streams to swell very quickly during a rain and loose their water very fast afterwards. This quick filling and emptying results in higher water speeds leading to further erosion and loss of fish habitat. In the winter, shallow water will freeze to the river bottom and during the spring thaw, act like a bulldozer rip up all the fish eggs and destroy nursery habitat. The siltation and chemicals from many mining processes will both clog stream beds and poison river water.