Reuters: Ozone isn’t just a greenhouse gas that’s contributing to global warming; it’s also a killer, according to a new report in The New England Journal of Medicine this week. “We see it as a much greater public health threat than we previously thought,” study investigator Dr. Michael Jerrett of the University of California at Berkeley told Reuters Health. The research, the first to look separately at the effects of ozone and fine particulate matter, an easier-to-control pollutant, …