A common message in use to convey the seriousness of climate change to the public is: ‘Carbon dioxide levels are higher today than they have been for the past one million years!’ This new study by Brian Schubert (University of Louisiana at Lafayette) and coauthors Ying Cui and A. Hope Jahren used a novel method to conclude that today’s carbon dioxide (CO2) levels are actually higher than they have been for the past 23 million years.
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