In low- and middle-income country (LMIC) contexts such as Sub-Saharan Africa and South Asia, between 44 percent to 51 percent of urban populations are unserved by piped water and 72 percent to 84 percent lack sewered connections.
Methane emissions are the second largest driver of global warming. Sanitation systems contribute to anthropogenic methane emissions if the biological decomposition of human feces is facilitated by anaerobic technologies.