The coming era of unlimited -- and free -- clean energy

In the 1980s, leading consultants were skeptical about cellular phones. McKinsey & Co. noted that the handsets were heavy, batteries didn't last long, coverage was patchy, and the cost per minute was exorbitant. It predicted that in 20 years the total market size would be about 900,000 units and advised AT&T to pull out. McKinsey […]