?url_ver=Z39.88-2004&rft_id=10.1038%2Fnclimate3158&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Carlson%2C+K.M.&rft.aulast=Carlson&rft.aufirst=K.M.&rft.issue=1&rft.volume=7&rft.date=2017&rft.issn=1758-678X&rft.atitle=Greenhouse+gas+emissions+intensity+of+global+croplands&rft.title=Nature+Climate+Change&rft.pages=63-68&rft.genre=article