The national temperament is changing with the U.S. Congress enacting tougher rules on sulfur dioxide, nitrogen oxide and mercury while the U.S. Environmental Protection Agency is beginning to clamp down on greenhouse gases.

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For years green groups have been trying to persuade the Environmental Protection Agency (EPA) to set a limit for the amount of nitrogen and phosphorus allowed in the states whose rivers feed the Mississippi.

ECONOMIST: Nutrient pollution

The Environmental Protection Agency (EPA) estimates idling trucks consume nearly one gallon of fuel per hour, while emitting nitrogen oxides and particulates, which contribute to smog.

CNN: An eco-friendly way to cool big trucks