Kyle Biesel points to the algae in the channel behind his home in St. Marys, Ohio. The algae blooms of the past were fueled largely by decrepit sewage systems that spewed nutrient-rich human waste into fresh water. The modern blooms are caused by chemical runoff from agriculture.
(Photo by John Seewer / File / AP)
A Cambodian vendor carries household goods on his motorbike for selling through a village of Samroang Andet at the outskirt of Phnom Penh, Cambodia.
(Photo by Heng Sinith / AP)
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