Yet, there's no commercial farming of these birds nowadays.

然而，现在并没有对这些禽类进行商业化的养殖。

Many of those forests are being severely reduced by development, including mining, logging and commercial farming.

很多森林因为开发而严重缩减，包括开矿、砍伐和商业农场。

Now, by commercialization -- commercialization is not about commercial farming alone.

现在， 通过商业化— —商业化不仅仅是商业化农业。

More specifically, it is bad for commercial seaweed farming, a business with revenues of (depending on whom you ask) between $6bn and $40bn a year.

更具体一点，它对商业海草养殖不利，这一业务每年的收入(视具体情况而定)在60亿至400亿美元之间。