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[0] 1 [Skeptic Argument] “Climate’s changed before” [One Liner] But it won't change back if we don't do something about it. [Paragraph] 
Natural climate change in the past proves that climate is sensitive to an energy imbalance. If the planet accumulates heat, global temperatures will go up. Currently, CO2 is imposing an energy imbalance due to the enhanced greenhouse effect. Past climate change actually provides evidence for our climate’s sensitivity to CO2.
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