Florida beaches brace for 5,000-mile blob of seaweed to deposit rotting goop

Enormous clump of floating algae threatens to bring pungent odor of rotting eggs to tourist beaches of Gulf of Mexico

It's brown, it weighs millions of tons, it stretches over 5,000 miles and it is headed for Florida's beaches. An enormous clump of seaweed circulating the Gulf of Mexico and Atlantic is set to coat beaches in a spongy goop, bringing with it a pungent odor similar to rotting eggs.

The huge mass of sargassum is the latest in a series of massive blooms scientists have noticed in the Atlantic since 2011 but could be the largest yet. It is pushing west through the Caribbean and beaches in Cancun, Mexico, and Key West, Florida, have already seen large mats wash ashore.