A recent study carried out by the University of Louisiana at Lafayette has suggested that CO2 levels are higher today than they have been for the past 23 million years.
Led by Dr. Brian Schubert, the project researchers measured the relative amounts of two stable carbon isotopes using fossilised plants.
The research enabled them to calculate CO2 concentrations during the period the plants grew.
As a result, the team produced a new record of atmospheric CO2 than spans 23 million years of uninterrupted Earth history.
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