There are several challenges here. One is that a general consensus has arisen that a reduction in the carbon waste which enters the atmosphere from traditional forms of power generation is necessary to slow or reduce dangerous climate change. This means a move from an economy based around the generation of power from coal, oil, and to an extent gas, and towards one based upon renewable, abundant, and satisfactory replacements. The challenge is that hydrocarbon power is a really efficient and effective form of power for electricity grids, cars, aeroplanes, heating, and factories. It is also globally used by competitor economies. Switching from it might therefore limit the capacity of economies, create advantages for competitors, lower living standards, and reduce the amount of investment capital available for the development of renewable resources. A second challenge is that the renewables sector is one covering a great many things. Some of these things, whilst improvin...