We will spend only a limited amount of time on non-commercial energy sources , focusing instead on the commercial supply ( and demand ) alternatives and their environmental and economic impacts .
我们将花少部份时间在非商业性的能源方面，而将大部份时间针对商业供给（及需求）的替代方案，及对环境与经济的影响进行讨论。
non-commercial energy