?url_ver=Z39.88-2004&rft_id=doi%3A10.1073%2Fpnas.0909994106&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Grubler%2C+A.&rft.aulast=Grubler&rft.aufirst=A.&rft.issue=43&rft.volume=106&rft.date=27+October+2009&rft.issn=0027-8424&rft.atitle=Problems+with+burden-sharing+proposal+among+one+billion+high+emitters&rft.title=Proceedings+of+the+National+Academy+of+Sciences&rft.pages=E122-E123&rft.genre=article