Urban Tilth is getting Richmond’s youth excited about sustainability and healthy eating. The West Contra Costa Country organization works with schools, businesses, and local governments toward a goal of producing 5 percent of the community’s food supply from school and community gardens. And with a new, sliding-scale Community Supported Agriculture (CSA) program that’s set to launch soon, it’s well on its way to doing just that. It also runs programs in K-12 schools and during the summer, and measures its success by the fact that 70 percent of its paid summer staff — who lead workdays and install gardens around the Bay Area — started out as youth apprentices. Soon to open a new farm stand in North Richmond, Urban Tilth is sowing seeds in the parts of the county that need it most.