Ambitious greenhouse–gas emissions cuts are needed to limit the global mean above preindustrial levels. A study now finds that the land sink for CO2 appears into climate models, suggesting that emissions cuts may need to be even more annual temperature increase to 1.5 °C much smaller than is currently factored ambitious than currently estimated.
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Mark A. Bradford is at the School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut 06511, USA.
e-mail: mark.bradford@yale.edu