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

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

A thinning of stratospheric ozone that occurs over the poles during the spring

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

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

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

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

Distance north or south from the equator

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

Layer of atmosphere at an altitude of 15-40km in which ozone absorbs UV solar radiation

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

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