Guardian: What began as a research project for two Stanford Phd students in 1996 has now spread to every continent and practically every personal computer in the world. In less than two decades, Google has changed the way we use the worldwide web. But the search engine and technology company doesn't want to stop at your computer or smart phone: it wants to change the way the world is powered. Google stops short of bold proclamations about a grand vision for its sustainability strategy. After all, founders...