00:00The Great Atlantic Sargassum Belt, a living stain transforming our ocean.
00:05From space, it looks like a living stain across the Atlantic.
00:10A massive brown belt of floating seaweed stretching thousands of miles from West Africa toward the Caribbean and the Gulf
00:17of Mexico.
00:18Scientists call it the Great Atlantic Sargassum Belt.
00:22And at its peak, in 2018, it contained more than 20 million metric tons of sargassum.
00:30That is roughly 44 billion pounds of floating life.
00:35Sargassum itself is not evil.
00:38In the open ocean, floating mats can provide shelter for fish, crabs, shrimp, sea turtles, and countless tiny creatures.
00:44In the right amount, it becomes a drifting habitat.
00:48The problem begins when there is too much.
00:51Huge blooms can wash onto beaches in the Caribbean, Florida, Mexico, and the Gulf Coast.
00:56Once the seaweed piles up and starts rotting, it can smell terrible, release irritating gases, smother coastlines, hurt tourism, clog
01:06fishing areas, and create problems for turtle-nesting beaches.
01:10So why is it exploding?
01:12Scientists point to a mix of ocean currents, warming waters, nutrient changes, river runoff, wind patterns, and upwelling that can
01:20bring deep nutrients to the surface.
01:23The exact recipe changes year to year, but the result is the same.
01:28More fuel for the bloom.
01:31More seaweed crossing the Atlantic.
01:34More coastal communities left to clean up the mess.
01:36That is what makes the Sargassum Belt so strange.
01:41It is not simply pollution.
01:43It is not simply climate change.
01:46It is not simply natural ocean life.
01:49It is all of those forces colliding inside one enormous floating system.
01:54A little Sargassum can be a nursery.
01:57Too much becomes a choking blanket.
02:00And from orbit, scientists can now watch that blanket grow, drift, break apart, and crash into shorelines.
02:07The Atlantic is not just changing beneath the waves.
02:11It is growing a living belt on top of them.
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