没人知道究竟有多少美国人靠国家公共事业的网络生活—依靠发电机或替代能源，如太阳能、风能和地热能。
No one is sure just how many Americans live off the national public-utilities grid - relying on generators or alternate energy sources such as solar, wind and geothermal.
该项目的重点是风力、太阳能、水力、地热能发电和提高工业能源效率。
The project will focus on wind, solar, hydro, geothermal power and industrial energy efficiency.
地热实际上完全没有碳排放，而且比无法持续发电的风能和太阳能更可靠。但是即便如此，地热在世界能源供给中只占了非常小的一部分。
But geothermal, virtually free of carbon emissions and more reliable than intermittent wind and solar energy, still provides only a small slice of the world's energy.
最佳选择是风能、太阳能、地热能、潮汐能和水力发电——这些能源都来自于风力、水力和阳光（被称为WWS——wind，water，sunlight）。
The very best options were wind, solar, geothermal, tidal and hydroelectric power—all of which are driven by wind, water or sunlight (referred to as WWS).
作者的计划需要在全世界建造380万台大型风力涡轮机，9万座太阳能发电厂，和大量转换地热、潮汐、屋顶光伏能量的装置。
The authors' plan calls for 3.8 million large wind turbines, 90, 000 solar plants, and numerous geothermal, tidal and rooftop photovoltaic installations worldwide.
不同于风能和太阳能，地热电站可以夜以继日、年复一年地发电。
And unlike wind or solar, geothermal generating stations can run day and night, year in and year out.
为解决能源问题，开发可再生能源，利用闭式循环将地热系统和太阳能系统联合起来发电。
The utilization of closed loop, which generates power by combining the geothermal system with solar energy system, is feasible to solve energetic problem and to exploit renewable energy.
书中包含了很多人类不得不面对和解决的问题，如：水资源对人类生存的重要作用，环境保护问题，对矿产资源和金属资源的利用，对可再生资源的需求，如：生质能发电、太阳能发电和地热发电。
It looks at the role water plays in sustaining life, the problems of conservation, the use of minerals and metals and the need for renewable resources, such as biomass, solar and geothermal power.
书中包含了很多人类不得不面对和解决的问题，如：水资源对人类生存的重要作用，环境保护问题，对矿产资源和金属资源的利用，对可再生资源的需求，如：生质能发电、太阳能发电和地热发电。
It looks at the role water plays in sustaining life, the problems of conservation, the use of minerals and metals and the need for renewable resources, such as biomass, solar and geothermal power.
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