For each dollar motorists spend on their vehicles somebody spends more than a dollar to park it. To reduce these costs many jurisdictions are eliminating or reducing parking requirements and encouraging more efficient parking management. You can too!
The San Francisco Board of Supervisors is considering adopting an "Urban Agriculture Incentive Zone" policy to incentivize the development of urban gardens on empty lots (which actually do exist in San Francisco).
Cleveland, Ohio has pursued an aggressive policy of greening it vacant and underused land. A program called Garden Boyz employs local youth to tend the gardens, keeping the landscape vital and keeping the kids out of gangs.