Environmental Science
Euro II standard refers to _________

Increasing sulfur content in fuel
increasing carbon content in fuel
Lowering sulfur content in fuel
Lowering carbon content in fuel

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

The insulating properties of snow
Circulation of heat by the atmosphere and oceans
Concentration of earth's magnetic field lines at the poles
Conduction of heat through the interior of the earth
Release of latent heat to the atmosphere when polar ice melts

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