"I am sure.This,I'm sure, is what we should be doing in the future: paying for the environmental services we get from our environment and paying the people who take care of these services.

VOA: standard.2010.02.24

So, fuel economy and environmental conservancy make a lot of sense if you care about such things, of course.

所以，油价和环境保护,是很有意义的,如果你关心这样的事，当然会更好。

麻省理工公开课 - 固态化学导论课程节选