To answer Tallg's question:
I attended a meeting by Mr. Bolton who is the head manager of the environmental department of United Development Company which is building the Pearl. He stated that because they did not do rainbow dredging, rather put a bund in place (like a big wall) and dredged into the bund, erosion was held in check. He further stated the area where the pearl is located was a fished out location only 10m deep. Little to no vegetation or animal life was to be found there previously. Since the pearl has been built, a natural regneration of both vegetation and marine life has occured. He gave slide examples and statistics to back up his statements. All in all, a very impressive presentation. Now whether I believe it all or not (could possibly all be BS) is still a question.