In Mediterranean coastal countries, Caulerpa taxifolia is causing ecological devastation since the seaweed has displaced coral reef plant and fish communities. There is biological damage because the native plants and animals associated with these areas have been replaced by carpets of Caulerpa which have smothered the reefs. Boats with anchors, and fishing lines, would get a tiny piece of Caulerpa attached to them and over time vast areas of Mediterranean waters became infested. Fishing resources became affected, and scuba divers and snorkelers no longer visit areas that previously had beautiful reefs with colorful plants and marine life. Economic impacts now exist in parts of the Mediterranean Sea and Australia to tourism, recreational activities, and fisheries but nothing can reverse the presence of Caulerpa. That is why the quick action in Carlsbad provides important lessons.