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Negative carbon isotope excursions measured in marine and terrestrial substrates indicate large-scale changes in the global carbon cycle, yet terrestrial substrates characteristically record a larger-amplitude carbon isotope excursion than marine substrates for a single event. Here we reconcile this difference by accounting for the fundamental increase in carbon isotope fractionation by land plants in response to increasing atmospheric CO 2 concentration (pCO 2 ). We show that for any change indoi:10.1038/ncomms2659 pmid:23552068 fatcat:wws7r3u43bdo5bv5yei4rmvey4