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Illegal dump sites proliferate in some of the Tijuana canyons that make up the Tijuana River watershed in Mexico. They send trash and sediment downstream, clogging the estuary and threatening birds and other wildlife.

Above: Illegal dump sites proliferate in some of the Tijuana canyons that make up the Tijuana River watershed in Mexico. They send trash and sediment downstream, clogging the estuary and threatening birds and other wildlife.