Chronicle: In the vine-entangled forests of the Aguarague National Park, crude that seeped for decades out of abandoned wellheads saturates the soil and has stained the bedrock of creeks that provide water to the indigenous Guarani who live nearby.
The petroleum stench is overpowering as David Benitez, who lives in the park and grazes his cattle among the wells, sifts tainted soil between his fingers.
"The odor is much stronger in the summer, when there's no water to wash the oil downstream," says the...