How does walking rather than riding in a car save resources

1). It cuts down on the energy resource consumed today to move your mass around town, and the energy resource used tomorrow to scrub your carbon out if the air in your town.
2). It cuts down on the health care resources necessary in 50 years from now, when your legs have shriveled up, and your lungs and heart don't work too well because you never bothered to exercise them when you were younger.