Steve Leatherman, a Florida International University professor of environmental studies also known as "Dr. Beach," walks along the sargassum to research the tons of seaweed covering Miami Beach in Florida on Thursday. /VCG Photo

The large amount of seaweed is upsetting tourists. Miami authorities have used heavy machinery to remove it from the beaches. /VCG Photo

Scientists have warned that deforestation of the Brazilian forest and the resulting fertilizer discharges in the Amazon River have led to the seaweed bloom in the Atlantic, extending from Africa to the Caribbean and the Mexican coast. /VCG Photo