Twenty-seven-year-old Brent Schulkin has a theory: The best way to stop global warming isn’t with radical activism, but by politely asking businesses to make environmentally responsible changes, and then rewarding the most cooperative business by inviting friends and friends of friends to buy exclusively from it. Schulkin, a former corporate team builder, tested his theory last March: He asked 23 minimart owners in San Francisco’s Mission District what percentage of their profits…

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Read more stories by Jennifer Roberts.