Very little that humans now do is natural, and it's getting less natural by the day.  By unnaturally circumventing natural population control without controlling their reproduction, humans have grossly overpopulated the planet.  Add to that all of the unnatural human destruction, like that mentioned in this post, and you have a totally unnatrual situation that's killing the planet.

The specific culprits here are those who purchase the floral greens as well as those who pick them.  On the supply end, preventing this type of ecological destruction would be a far better use of the military than killing innocent people in other countries for oil.