Some good alternatives to cement sidewalks include sidewalks made with pervious concrete. Unlike asphalt and cement sidewalks, pervious concrete sidewalks allow for storm water to be directly absorbed by the concrete and then into the ground thus recharging the groundwater supply, not to mention avoiding problems such as runoff in lakes and streams.
Good answer. Another potential are sidewalks made out a blend of pervious substances and recycled tire rubber, which can help make the surface more porous, allows the sidewalk to expand and contract with temperatures changes and makes it a little softer to walk on.
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