PowerPoint Presentation

Ozone Concentration


q	The observed depletion of the stratospheric ozone (O3)
	layer from 1979 to 2000 is estimated to have caused a
	negative radiative forcing (–0.15 Wm^-²).

q	The total amount of O3 in the troposphere is estimated
	to have increased by 36% since 1750, due primarily to
	anthropogenic emissions of several O3-forming gases.
	This corresponds to a positive radiative forcing of
	0.35 Wm^-².