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 11,500–14,000MtC_eq for 2010 and of 12,000–16,000MtC_eq 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/tC_eq (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