On Earth Day, a look at San Diego's zero waste policy — the city’s goal to recycle, reuse and stop generating waste by the year 2040. Plus, besides a restaurant and urban garden, the business model of the nonprofit MAKE Projects in North Park is a job training center for refugees and immigrants. And it’s already making a difference. Finally, this weekend in the arts: Black Artist Collective at The Old Globe; Yolanda López and Irma Sofia Poeter; "Mother of the Maid" at Moxie; Broadway San Diego presents "Rent"; Anya Gallaccio at Quint ONE; the Symphony; and Spellling at the Casbah.