Environmental Science

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Distance north or south from the equator

A cloud that forms at altitudes of 21,000m during Arctic and Antarctic winter or early spring

A gradual increase in the average global temperature that is due to a higher concentration of gases such as carbon dioxide in the atmosphere

An international treaty according to which developed countries that signed the treaty agree to reduce their emissions of carbon dioxide and other gases

A gas composed of molecules that absorb and radiate infrared radiation from the sun

A periodic occurrence in the eastern Pacific Ocean in which the surface water temperature becomes unusually cool

Average weather conditions in an area over a long period of time

Hydrocarbons in which some or all of the hydrogen atoms are replaced by chlorine and fluorine; use is restricted because they destroy ozone molecules in stratosphere