A Yale University dropout founded what he says is the largest youth organization in the world to address the climate crisis: Billy Parish became the head of Energy Action Coalition when he was 25 in 2003. His organization developed campaigns for colleges to commit to zero carbon pollution, started a company called Solar Mosaic where the public can invest in crowd funded ecological enterprises, and wrote Making Good: Finding Meaning, Money, and Community in a Changing World (2012) with co-author Dev Aujla. Parish says, “Change starts with the simple belief in progress.” He recommends, “Choosing the right people to work with is the single biggest factor that will impact your success.” He recognizes the global energy system needs to be replaced with wind, solar, and ocean wave clean energy sources, at the cost of $100 trillion. The question is who will control the system? He points to the German model where half of its energy comes from renewable sources mostly owned by the people. Another model is the US military that recognizes the need for energy independence and cost savings, aiming for at least 25% of its energy from renewable sources by 2025.