短语讲解：

1. Vertical farm supporters say the methods are good for the environment, and good for the world’s growing population.

be good for 值得，有效; 利于
例句：Do it up. It'll be good for you.
把它喝完，它对你有益。

2. We think about amaranth -- one of the most popular greens in Africa and Southeast Asia.

think about 考虑…; 捉摸…
例句：Even now when I think about it I feel pain in my heart.
就是现在想起来我心里都感到难受。