It was diving in the Great Barrier Reef in Australia that sparked Andy Ridley’s interest in environmental issues. Shocked at its state, he joined WWF and went on to launch Earth Hour in 2007, the huge climate change awareness campaign that sees buildings in 7,000 cities turn off their lights. Now, in his new role as CEO of Circular Economy, a Netherlands-based social enterprise, Ridley wants to build a similar global grassroots movement to accelerate…