pollute

The area of polluted ground stretches to about 100 acres, or the equivalent of about 65 - 70 football pitches.

The vehicles tend to be heavier, larger and more polluting than other cars, and researchers say they are more dangerous to pedestrians and cyclists.

The authors said their findings at the Tijuana River point to a need for more research into air pollution coming from other polluted rivers and lakes around the world.

The water that once sustained the community is horribly polluted and younger characters dream of escape; Mal, the mother of two daughters, is visited by a shapeshifter in her dreams.

"It is much more difficult than it is in the US. It's more expensive. It's more polluting. It's more disruptive."