It has slashed local energy demand, reducing chronic pollution and leaving more oil for export.

ECONOMIST: Iran's bold economic reform

Pollution from them causes chronic and acute respiratory ailments and premature death, and it contributes to global warming.

NPR: EPA Proposal Eases Rules on Pollution Controls

As Eric Hobsbawm has said, terrorism is a new kind of urban pollution, and the pollutant is an insidious and chronic disquiet.

NEWYORKER: Laureate of Terror