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2 Ie 310

" Adapted from IPCC (1996).

h Assuming an increase from 25 to 50 ppb throughout the Northern Hemisphere; see discussion for range and regional effects. ' Change from preindustrial times to 1992.

'' Referenced to C02 and assuming C02 concentration is constant at mid-1990s levels. ' Includes estimated effects of CH4 on production of tropospheric 03 and stratospheric H20. ' Does not include indirect effects on tropospheric 03 and stratospheric H20.

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