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Table SPM.1 Estimates of potential global greenhouse gas emission reductions in 2010 and in 2020

Table SPM.1 
Estimates of potential global greenhouse gas emission reductions in 2010 and in 2020
(Sections 3.3 >3.8  and Chapter 3 Appendix)
Sector Historic emissions in 1990 Historic Ceq annual growth rate in 1990-1995 Potential emission reductions in 2010 Potential emission reductions in 2020 Net direct costs per tonne of carbon avoided
(MtCeq/yr) (%) (MtCeq/yr) (MtCeq/yr)
Buildings a CO2 only 1,650 1.0 700-750 1,000-1,100 Most reductions are available at negative net direct costs.
Transport CO2 only 1,080 2.4 100-300 300-700 Most studies indicate net direct costs less than US$25/tC but two suggest net direct costs will exceed US$50/tC.
Industry CO2 only 2,300 0.4
-energy efficiency 300-500 700-900 More than half available at net negative direct costs.
-material efficiency ~200 ~600 Costs are uncertain.
Industry Non- CO2 gases 170 ~100 ~100 N2O emissions reduction costs are US$0-US$10/tCeq.
Agriculture b CO2 only 210 Most reductions will cost between US$0-100/tCeq with limited opportunities for negative net direct cost options.
Non- CO2 gases 1,250-2,800 n.a 150-300 350-750
Waste b CH4 only 240 1.0 ~200 ~200 About 75% of the savings as methane recovery from landfills at net negative direct cost; 25% at a cost of US$20/tCeq.
Montreal Protocol Non-CO2 gases 0 n.a. ~100 n.a. About half of reductions due to difference in study replacement applications baseline and SRES baseline values. Remaining half of the reductions available at net direct costs below US$200/tCeq.
Energy supply and conversion c CO2 only (1,620) 1.5 50-150 350-700 Limited net negative direct cost options exist; many options are available for less than US$100/tCeq.
Total 6,900–8,400d 1,900–2,600e 3,600–5,050e

Source:  IPCC TAR SPM of WG III

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