 |
討論內容: |
The line's engaged http://poweltonvillage.org/custom-essay-professional/ need essay Unlikely. How much of the world璽??s electricity do solar and wind produce? After decades of subsidies, less than 1%. The reasons for this have been well understood for decades. Because sunlight and wind are low-density energy, they require vast land and material resources to capture. And worse, because sunlight and wind are unreliable energy, they always need a backup, which is almost always fossil fuels.
|