Process without a simple proportional relation between cause and effect.
The climate system contains many non-linear processes, resulting in a
system with very complex behavior.
Note: Complex systematic behavior does not imply dramatic chaotic behavior; multiple cause and effect processes 'overlap' in their effect - much like waves in a sea, often canceling each other out and creating relative 'calm'. Although every once in a while you will get effects that mutually enhance each other and cause dramatic short or long term lived events or features in the climate (i.e. tornadoes, gulf streams, etc).
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