Does growing plants in a greenhouse have environmental benefits?

Some medicinal plants are on the endangered species list, and some have disappeared already. It's a concern, of course. Echinacea doesn't seem to be endangered, but often the wrong plants are harvested because people don't know what they're doing.

But yes, what we're doing can protect endangered species and, hopefully, in the future, once we go to work on other plants that may be on the CITES [Convention on International Trade in Endangered Species of Wild Fauna and Flora] list, then greenhouse growing ought to have a beneficial aspect.
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