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Figure 10.6a (upper): Regional distribution of CH4 emissions from wastewater and human sewage in 1990 and 2020.
Figure 10.6b (lower): Regional distribution of N2O emissions from human sewage in 1990 and 2020. See Table 10.3 for total emissions.
Notes: The US estimates include industrial wastewater and septic tanks, which are not reported by all developed countries.
Source: UNFCCC/IPCC (2004)