IPCC Fourth Assessment Report: Climate Change 2007
Climate Change 2007: Working Group III: Mitigation of Climate Change
Figure 10.6

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)