Over time, the use of coal will depend a lot upon what kind of research and development can lead to cleaner coal alternatives.

随着时间的推移，煤炭的使用将在很大程度上取决于什么样的研究和开发可以带来更清洁的煤炭替代品。

I want to end this lecture summing up, drawing a lot upon Milgram and some other work, and talk first about two forces for evil and then to end by talking about two forces for good.

我想在结束讲座时总结一下，主要借鉴米尔格拉姆和其他一些研究，先谈论两种邪恶力量， 然后讨论两种善良力量以结束。