The findings may deflate some climate skeptics, who used the poor dating of ice cores to question the link between carbon dioxide and warming, said Robert Mulvaney, a glaciologist with the British Antarctic Survey, who was not involved in the study.
It also confirmed the view of most climate scientists that in the past, rising temperatures and carbon dioxide were locked in a feedback loop, where high temperatures led to more carbon dioxide being released from the deep oceans, which increased temperatures further, Mulvaney said.
But because predictions of future warming are based on recent carbon dioxide and temperature data, not historical models, "it hasn't really changed anything about our understanding of how climate change will change our modern environment." Mulvaney told LiveScience.
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Image Gallery: One-of-a-Kind Places on Earth The Reality of Climate Change: 10 Myths Busted 8 Ways Global Warming Is Already Changing the World This article originally appeared on LiveScience. Copyright 2013 LiveScience, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.