目前,水电、石油、煤和天然气还是世界上主要的能源,然而这些能源并非可持续发展的绿色能源,极大地污染着我们的生存环境。其实,在我们脚下的地球中还有一个我们关注较少的能源,这种新能源不仅储量大,而且污染很小,这种日渐受到重视的能源就是地热。 At present, hydropower, oil, coal and natural gas are still the main energy sources in the world. However, these energy sources are not sustainable green energy sources and greatly pollute our living environment. In fact, there is a less-watched energy source in the earth under our feet. This new energy source is not only large in reserves but also very small in pollution. This increasingly important energy source is geothermal energy.