Zivin, Joshua S Graff Spatial and temporal heterogeneity of marginal emissions : Implications for electric cars and other electricity-shifting policies / Joshua S. Graff, Zivin Matthew and Kotchen Erin T. Mansur - Cambridge NBER 2012 - 43p - NBER Working Paper ; 18462 . Subjects--Topical Terms: NBERWP 18462E8749.pdf