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Volcanoes are a good example of one event that could cool the atmosphere, though it needs to be a huge explosive eruption, usually in the tropics. Another would be a reduction in sun spots, though this only has a minor effect. Finally, orbital variations can cool the earth, though this is at much longer time scales than humans would observe.

OR fridge doors being left open

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13y ago
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8y ago

The main cause - is that we're still 'emerging' from the last ice-age... therefore temperatures will continue to rise. HOWEVER - the pollution emitted by man-made sources is an accelerating factor that MUST be taken into consideration.

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11y ago

A volcano because as it eruptes the lava ash goes into the air and blocks the sun causing it to cool the temperature in the atmosphere.

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9y ago

An event that can cause sudden changes to Earth's global climate is something similar to the Permian-Triassic extinction event. Massive volcanism is a possible cause.

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Q: What is most likely to cause widespread change in the climate on earth?
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