In no particular order:
1. Start an organization that teaches critical thinking, scientific thinking, and thinking based on humanistic values.
2. Get more activists more interested in using tools for problem analysis, brainstorming, and decision analysis. I'd especially like to see these tools used in promoting "green" technology.
3. Write books, articles, tracts, whatever that would make the humnaistic worldview more attractive (humanist tracts in bus stations, train stations, and hotel rooms???)
4. Lead a rapid conversion to green technology, nanotechnology, and ecological design.