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The answer to the supply ______ of lithium (锂) is, quite literally, that there is no one answer. The question of a lithium-powered future is not solely an issue of resource quantity equaling resource output. Three additional areas of concern need to be addressed: economic demands, foreign relations, and the environmental impact of mining. Whenever a resource is ______ out of the ground and then sold on the open market, it begins a chain of reactions that cannot be ______. It is true for oil and it is true for coal, as well as any other metal or mineral you care to name. These three elements are so fundamentally interrelated and of ______ significance; they will be addressed here in combination rather than sequentially. The argument that there is enough lithium or not enough lithium is, in a way, not the point. The concept of switching our current lifestyle from complete dependence on one ______ resource to complete dependence on another is ______. Clouds may block the sun, droughts reduce water supply, the wind may become more erratic (不稳定的) in speed, and the earth’s resources will begin to be extinguished. No source of energy we have yet harnessed is completely self-renewing and ______, and to build a one-size-fits-all solution from a molecule of lithium is narrowing and perpetuates the problem. Actually, appropriate technology usage distributes the energy requirement. You do not need a power saw to slice your morning toast. The real driving force and ______ behind green technologies and green energy movement is a(n) ______ of energy generation. A sizable system of solar panels (太阳能电池板) just outside of a small town in the ______ desert can supply its entire energy needs. The same cannot be said for a foggy city. So how is lithium a part of that solution?