Excellent video. As anyone knows who has set up a home aquarium the two keys of suppressing algae is nutrient-free water and the proper water temperature. The phosphates and nitrates that abound in nutrient rich waters is the perfect growth formula for algae, and sargassum sea grasses. Add to this a touch of global warming (just a degree or two) and the problem intensifies quickly. As he points out the farm run-offs from fertilizers, etc. in the southern U.S. and South America are the primary culprits. The 23 islands of the Caribbean will need to unite and ask the United States, Brazil, etc. for financial assistance in combatting this problem. It's not going to get better on its own; it's headed full speed in the other direction. We have all seen it first hand in St. Martin, and on our most recent visit to Cancun it is gaining in intensity down there, too.