The Waru weren't the first anti-force creatures. Timothy Zahn got that bad idea started (along with many others) in Heir to Empire with the Vornskr. [starwars.wikia.com]
The range of mangroves along the Texas Coast is being tracked as an indicator of climate change. Currently, mangroves can be found along the coast to just north of Corpus Christi. It is anticipated that their range will expand northward as a result of climate change.
They also don't seem to have sold any of the islands. At least, it doesn't appear that anyone has made any improvements. It appears that the Palm Islands have been more successful: [en.wikipedia.org]
If you're looking for unintended consequences, you should discuss how terraforming of the Mississippi Valley has contributed to the formation of the dead zone in the Gulf of Mexico: [en.wikipedia.org]