West Marin is well known for its creative artists and thinkers. They go quietly about their business, appreciating our natural bounty and beauty, and, every once in a while, we get a glimpse of what they’re up to, what they’ve been working on and thinking about. Peter Barnes, the founder of Mesa Refuge and author of several books about economics, the climate, land reform and the commons, is one of those quiet thinkers. Lately he’s…