There is good agreement between the increase in atmospheric abundances of sulphur hexafluoride (SF6) and emissions estimates based on revised sales and storage data. (ipcc.ch)
The red region shows the habitable zone as extended inward for dry planets, with minimal surface water, a low water - vapor atmospheric abundance, and low atmospheric relative humidity and hence a smaller greenhouse effect. (hdstvision.org)
(If my math is to be trusted, that means a decline of about 126 ppm in terms of overall atmospheric abundance.) (hubpages.com)