 Nyora kupfuurira kweiyi ndima - Barker akatarisira kupfuurira kwekutsvakurudza kwekushandiswa kwekunyorera ku econometric modelling, kunyanya dzidziso uye kushandiswa kwehuwandu hwehupfumi-simba-zvakatipoteredza E3 mienzaniso. Achishandisa mienzaniso yakadaro yeE3, ave achikwanisa kushandisa kuongorora kwoupenyu kune dzidziso yezvokutengeserana kwenyika dzakawanda uye kumitemo yokuderedza magasi anokonzera kupisa. Akabatawo zvinzvimbo zvakasiyana-siyana, kusanganisira Coordinating Lead Author CLA, pasi pe Intergovernmental Panel on Climate Change, sangano rakakunda pamwe naAl Gore Nobel Peace Prize ye2007. Muna 2009 akapa hurukuro kuCOP 15 UNFCCC Conference of Parties chiitiko muCopenhagen. 