When raking leaves, be sure to keep them out of the streets. Leaf piles in the street decompose and are washed away down sewer drains. From there, they go into lakes and rivers, where the decomposing mess "feeds" the waterways, turning the lakes green -- from algae -- in the summertime. Instead, rake up leaves and run your lawnmower over them, and scatter the nutrient-rich matter all over the lawn to help feed it. Next summer, your lawn will be greener, healthier and richer.