Agence France Presse: Radical proposals to inject sulfur particles into the Earth’s stratosphere to cool it down and battle global warming could instead badly damage the ozone layer, a study warned Thursday. "Our research indicates that trying to artificially cool off the planet could have perilous side effects," said researcher Simone Tilmes from the National Center for Atmospheric Research. "While climate change is a major threat, more research is required before society attempts …