It has been suggested that climate
forcing associated with air pollution,
specifically tropospheric ozone (O3),
black carbon (BC) aerosols, and
methane (CH4) together represent a
greater climate forcing than the
forcing by CO2.
(Hansen, J., et al., Proc. Natl. Acad. Sci. 97, 9875-9880, 2000; 98, 14778-14783, 2001; Clim. Change 52, 435-440, 2002)
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