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Karenia brevis algae, which cause red tide blooms across the Gulf of Mexico, become two to seven times more toxic when levels of phosphorus, a major algal nutrient found in fertilizers and human waste, are low.

excess nutrients like phosphorus and nitrogen play key roles in fueling algal growth and harmful algal bloom development.

The researchers say the potentially looming Algaeworld might be avoided if those in the agricultural industry use "better management practices." Having the U.S. agree to a solid climate treaty probably wouldn't hurt, either.