Referring to Figure 6.1, what is the approximate total cost of achieving 38-gigaton reductions in carbon dioxide equivalents, below the 2030 baseline? Hint: The answer has to do with the area of two triangles.

Figure 6.1

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Abatement cost $ pertCOe 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 Residential electronics Residential appliances -Retrofit residential HVAC Waste recycling Low penetration wind Cars plug-in hybrid Degraded forest reforestation Degraded land restoration- Pastureland afforestation Tillage and residue mgmt 2nd generation biofuels Insulation retrofit (residential) Cars full hybrid Building efficiency new build Cropland nutrient management Nuclear 16 Electricity from land gas Clinker substitution by fly ash 20 25 Organic soil restoration Geothermal Small hydro 1st generation biofuels Rice management Efficiency improvements other industry Motor systems efficiency Insulation retrofit (commercial) Lighting-switch incandescent to LED (residential) Grassland management Reduced pastureland conversion Reduced slash-and-burn agriculture conversion Coal CCS retrofit Iron and steel CCS new build Coal CCS new build Power plant biomass co-firing Reduced intensive, agriculture conversion High penetration wind Solar PV- Solar CSP Gas plant CCS retrofit 30 35 38 Abatement potential GtCOe per year Activate