Amendments to the Montreal Protocol on protecting the ozone layer that were agreed in London in 1990 have finally been ratified by the required 20 countries. (newscientist.com)
The study, reported in the 1 September Geophysical Research Letters, credits international treaties designed to protect the ozone layer with turning the tide. (sciencemag.org)
WASHINGTON — After a brief but lively internal debate, the Obama administration has decided not to seek an immediate phase - out of hydrofluorocarbons (HFC's), a potent group of climate - warming gases, under a treaty aimed at protecting the ozone layer. (dotearth.blogs.nytimes.com)