The thinning of the stratospheric Support ozone layer during the past two decades has also reduced the net amount of heat energy retained by the climate system by an estimated 0.2 watts per square metre. [ 3CANADAENVIRON 0 MCLH 07/08/2017 ]

At higher altitudes, increases in NOx lead to decreases in the stratospheric Support ozone layer . [ 1IPCCAVIATION 0 MCLH 07/08/2017 ]

HFC and, to a lesser extent, PFC use has grown as these chemicals replaced about 8 % of the projected use of CFCs by weight in 1997; in the developed countries the production of CFCs and other ozone depleting substances (ODSs) was halted in 1996 to comply with the Montreal Protocol to protect the stratospheric Support ozone layer. [ 8IPCCATTENUATION 0 MCLH 07/08/2017 ]

Many of these, when they break down, release chlorine, bromine and/or fluorine atoms that then become responsible for depleting the stratospheric Support ozone layer. [ 5CANADAICC 0 MCLH 07/08/2017 ]

Halocarbons that contain chlorine (e.g., chlorofluorocarbons - CFCs) and bromine (e.g., halons) cause depletion of the stratospheric Support ozone layer and are controlled under the Montreal Protocol. [ 11IPCCBILAN2001 0 MCLH 07/08/2017 ]

The observed losses of stratospheric Support ozone layer over the past two decades have caused a negative forcing of 0.15 ± 0.1 Wm?2 (i.e., a tendency toward cooling) of the surface troposphere system. [ 11IPCCBILAN2001 0 MCLH 07/08/2017 ]