Question

65 which of these is an example of climate change caused by natural variation?
the decrease in average humidity of the air from draining swampland in an area
the decrease of rainfall from cutting down the trees in a rainforest
the increase in the sahara desert’s area from overgrazing by farm animals in north africa
the low rainfall that helped produce the dust bowl in the american great plains

Explanation:

Answer:

The low rainfall that helped produce the dust bowl in the American Great Plains

(Explanation: The first three options involve human activities (draining swampland, deforestation, overgrazing) causing environmental changes. The Dust Bowl's low rainfall was influenced by natural climate variability like changes in atmospheric circulation patterns, making it a natural - variation - driven climate change example.)