For generations, residents of the Southern California border town of Calexico watched as their river turned into a cesspool, contaminated by the booming human and industrial development on the other side of the border in Mexico.

For generations, residents of the Southern California border town of Calexico watched as their river turned into a cesspool, contaminated by the booming human and industrial development on the other side of the border in Mexico. https://t.co/fflL4e3Ee6

— NYT National News (@NYTNational) February 10, 2019