This is a common talking point to marginalize political activity in any situation: 'It's just a tiny minority agitating', etc. In every situation, a tiny minority appeals to the majority and sometimes it convinces them. (If a majority of Americans ever protested something, that would be over 160 million people in the streets. Just think of the logistics of food, water, and waste ... cellular data bandwidth ... Twitter, Facebook and Instagram load ...)
That's how change happens; we try to persuade each other. People who are more involved, motivated, skilled, available, etc. do more of the work. If there was an environmental problem in SF Bay, the people who have the knowledge and expertise about the issue, and the communication skills, would inform and try to persuade everyone else. I'm not going to investigate it myself.