Who’s Winning the Clean Energy Race? 2012 Edition

In less than a decade, clean energy transitioned from novelty products to the mainstream of world energy markets. The sector emerged not so much in a linear fashion as episodic—in fits and starts associated with the worldwide economic downturn, continent-wide debt crises, national policy uncertainty, and intense industry competition. Through it all, however, the clean energy sector moved inexorably forward, with overall investment in 2012 five times greater than it was in 2004.