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An ocean-atmosphere phenomenon in the tropical Pacific that occurs at irregular intervals between two to seven years.

The release of a pollutant, normally a gas, into the atmosphere.

Change in global climate over time.

Climate change is measured by changes in temperature in the atmosphere. In some periods the temperature change is very slow, in other periods the change can be quite fast.

A system that tries to reduce global greenhouse gas emissions by creating a market that makes it possible to have reductions where they have the lowest costs for the general economy.

The sum of evaporation and plant transpiration, which add water vapor to the atmosphere.

External factor that influences climate or a climate model.

Energy resources such as crude oil, natural gas and coal formed from the remains of prehistoric animals and plants.

The most important parts of a climate model.

The formation and growth of glaciers.