Hermann Scheer

A Social Democrat rather than a Green, Scheer earns his place because he wrote one of the most copied green laws anywhere. With Green MPs he drafted Germany's Renewable Energy Sources Act of 2000, which guaranteed fixed prices for solar and wind power fed into the grid; feed-in tariffs spread to dozens of countries and drove down solar costs. Critics point to the surcharge on household bills. He also campaigned for the agency that became IRENA.