Issue Date: April 9, 2012
Carbon Dioxide Rise Came First
A new study shows that the warming of Earth at the end of its last ice age was preceded by a rise in atmospheric CO2, supporting a causal relationship between increasing atmospheric CO2 and global warming (Nature, DOI: 10.1038/nature10915). These phenomena have long been known to be linked, but ice-core studies had generated conflicting results about which event happened first. Now, Jeremy . . .
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