Table 11.4
Estimates of potential global greenhouse gas emission reductions in 2010 and in 2020Historic emission
Historic CeqPotential emission Potential emissionin 1990annual growth rate in reductions in 2010 reductions in 2020Net direct costs per tonneSector(MtCeqyr−^1)1990–1995(%)(MtCeqyr−^1)(MtCeqyr−^1)of carbon avoidedBuildingsaCOonly 216501.0700–7501000–1100Most reductions are available atnegative direct costs.TransportCOonly 210802.4100–300300–700Most studies indicate net direct costsless than $US 25/tC but two suggestnet direct costs will exceed $US 50/tC.IndustryCOonly 223000.4Energy efficiency300–500700–900More than half available at net negativeMaterial efficiency∼200∼600direct costs. Costs are uncertain.IndustryNon-COgases 2170∼100∼100NO emissions reduction costs are 2
$US 0–10/tCeq.AgriculturebCOonly 2210Most reductions will cost betweenNon-COgases 21250–2800n.a150–300350–750$US 0 and 100/tCeq.with limitedopportunities for negative net directcost options.WastebCHonly 42401.0∼200∼200About 75% of the savings as methanerecovery from landfills at net negativedirect cost; 25% at a cost of$US 20/tCeq.