We tend to become social core groups, whatever our similar interest and background where we came through. It tends to be a filter through which people see themselves. It can be all different ethnicities. They can see themselves as San Franciscans, or Warriors fans. You want to build a tribe of viral advocates for that team.
Already renewable energy advocates are noting that the 42 miles of above-ground right-of-way between Yosemite and the city could be fitted with enough solar panels to generate at least 40 megawatts per year - a proposal the San Francisco Public Utilities Commission has never seriously considered because they currently aren't required to do so.