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landfill methane
Page 808
Appendix M
Landfill Methane Reduction
As shown in Chapter 25, the potential emission reductions for
CH4 from landfills are given in
column 1 of Table 25.8.1 Under
regulatory alternative 2, emissions from existing landfills can be
reduced by 60 percent, and new landfills by 65 percent. Multiplying
these percentages times the CH4
emissions in Table 25.7 as shown below yields 11.1 Mt of CH4 emission reduction per year.
Existing
18 × 0.60 = 10.8
New
0.53 × 0.65 = 0.34
TOTAL CH4 = 11.1 Mt/yr
Next, this number must be converted to CO2 equivalence. Information from the IPCC
shows that each kilogram of CH4 is
equivalent to 21 times the global warming potential of CO2 for a 100-yr time horizon. Therefore
11.1 Mt CH4/yr × 21 CO2 eq./CH4 =
233 Mt CO2 eq./yr
and
($22.5/t CH4)(1 CH4/21 CO2) =
$1.07/t CO2 eq.
Although these estimates are for 1997, it is assumed that they
would be roughly the same for 1990.
Note
1. Tons (t) are metric; 1 Mt = 1 megaton = 1 million tons.
