global change transport emissions reductions & technology choice in the us andreas schafer mit based on joint research w prof henry jacoby cmp sponsor researcher meeting june 11 2001 university park hotel cambridge ma introduction motivation approach and methodology key assumptions scenario analysis reference co 2 abatement conclusions next steps contents 0 5 10 15 20 25 30 35 40 45 50 5000 10000 15000 20000 25000 gdp cap 1985 tr a n spo r t secto s h ar e i f l er gy u switzerland netherlands korea poland china japan contd implications of ghg control policies transportation development demand energy use policy costs such impact economy is minimized sectoral emission dependent carbon intensity substitutability production factors ie capital for low fuel rich fuels etc other quantitative results necessary need models three eppa markal ed modal split task ga7 project consistent macro economic future simulate prices