Restoring Mangroves May Prove Cheap Way to Cool Climate

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3. Yes.

They are a native species. For many years they were chopped down and replaced with seawalls. Now efforts are underway to replant mangroves, with pretty good success. Mangroves are also good for cleaning the water and provide habitat for small sea-creatures and birds.

Edit: just to avoid confusion, they don't grow in the gulf itself-too salty. They grow in brackish water, half salt, half fresh. So mostly find them in bays, and along low shorelines with plenty of freshwater like Everglades and Big Bend areas (where rivers exit).