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1 Any factor that causes air that is not initially warmer or cooler than its surroundings to rise or sink. Some examples are convergence, divergence, frontal lifting, and orographic lifting.

2 The effect of any factor on one or more other physical processes that results in positive feedback. For example, it appears that the astronomical effects proposed by the Milankovich theory act as forcing for changes in the carbon cycle, with consequences for climatic change.

Subjects: Meteorology and Climatology.

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