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Footnotes to Table SPM-1 (Question 6.2.2)

a - Buildings include appliances, buildings, and the building shell.

b - The range for agriculture is mainly caused by large uncertainties about CH4, N2O and soil related emissions of CO2. Waste is dominated by landfill methane and the other sectors could be estimated with more precision as they are dominated by fossil CO2.

c - Included in sector values above. Reductions include electricity generation options only (fuel switching to gas/nuclear, CO2 capture and storage, improved power station efficiencies, and renewables).

d - Total includes all sectors reviewed in Chapter 3 for all six gases. It excludes non-energy related sources of CO2 (cement production, 160MtC; gas flaring, 60MtC; and land use change, 600-1,400MtC) and energy used for conversion of fuels in the end-use sector totals (630MtC). Note that forestry emissions and their carbon sinks mitigation options are not included.

e - The baseline SRES scenarios (for six gases included in the Kyoto Protocol) project a range of emissions of 11,500–14,000MtCeq for 2010 and of 12,000–16,000MtCeq for 2020. The emissions reduction estimates are most compatible with baseline emissions trends in the SRES-B2 scenario. The potential reductions take into account regular turn-over of capital stock. They are not limited to cost-effective options, but exclude options with costs above US$100/tCeq (except for Montreal Protocol gases) or options that will not be adopted through the use of generally accepted policies.

Source & ©  IPCC TAR SPM of WG III

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