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A special cave in Spain famed for the extensive prehistoric art in its walls was excavated for the first time by scientists, uncovering pretty fascinating idea on what ancient Neanderthals and modern humans used the cave for, and how long they of which it was used.
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.