412 如何全天候为世界供电——无需石油

Deep beneath the Earth sits 50,000 times more energy than all the world's fossil fuel reserves, but accessing it requires using the same controversial technology that oil companies spent trillions to develop: fracking. Cindy Taff left Shell to prove that drilling for geothermal heat instead of hydrocarbons can deliver what solar, wind and fossil fuels can't — clean, renewable power at all times, regardless of weather. Could this be the breakthrough that finally solves our energy challenges? 地球深处蕴藏的能量，相当于全球所有化石燃料储量的五万倍，但要开发这种能源，必须用到石油公司斥资数万亿美元研发的同一项争议性技术——水力压裂法。辛迪·塔夫（Cindy Taff）离开壳牌公司，就是为了证明：钻探开采地热，而非碳氢化合物，能够实现太阳能、风能与化石燃料都无法做到的事——无论天气如何，全天候提供清洁、可再生的电力。这会成为最终破解人类能源难题的重大突破吗？