The energy from the heat beneath the earth's surface is essentially an unlimited resource. What if it could be developed to help solve our energy challenges and fight global warming? Enhanced Geothermal Systems, or EGS, attempts to do just that. EGS produces heat and electricity by harnessing the energy from hot rock deep below the earth's surface, expanding the potential of traditional geothermal energy by orders of magnitude. EGS is a big challenge, but with the potential to power the world many times over, it demands our immediate attention. At Google we've launched an effort to advance EGS through R&D, investment, policy and information.

Shirky’s Law states that the social software most likely to succeed has “a brutally simple mental model … that’s shared by all users”.

Google has just launched Knol to the public, dubbed by many as the search giant’s Wikipedia killer. My first reaction: not so fast. While Knol offers a way for anyone to create content about any subject, there are a few big differences.

Change yourself. Change the world. Get your walk on.