Elevated garden on the street sidewalk

This is the way urban gardening really needs to happen. All of the open lots that are being converted to city community gardens are great, but in terms of growing edible food I think it's a bad idea due to the years and years of soil contamination. At least with an elevated bed one can control the nature of the soil, and tasty kale, tomatoes, and other plants can be harvested with less fear of bioaccumulated pollution.