Carl Ferenbach made his fortune through the Boston-based private equity firm Berkshire Partners. Since his retirement in 2012, he has devoted much of his attention to environmental philanthropy. He’s chairman of the Environmental Defense Fund and runs two green foundation and a third outfit that buys and preserves old Vermont farmland. Ferenbach is no billionaire, so we’re not talking about lots of big grants to lots of players. But there’s definitely money going out the door.