Worried scientists said Sunday they had found four new ozone-destroying gases in the atmosphere, most likely put there by humans in the last 50-odd years despite a ban on these dangerous compounds. It is the first time since the 1990s that new substances damaging to Earth’s stratospheric shield have been found, and others may be out there, they said. “Our research has shown four gases that were not around in the atmosphere at all until the 1960s, which suggests they are man-made,” the team from Europe and Australia wrote in the journal Nature Geoscience. They analyzed unpolluted air samples collected in Tasmania between 1978 and 2012, and from deep, compacted snow in Greenland. “The identification of these four new gases is very worrying as they will contribute to the destruction of the ozone layer,” added a statement from the team. MORE
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