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Carbon tetrachloride is one of several man-made gases that contribute to the depletion of the ozone layer high in the atmosphere. Because of this, restrictions were introduced on the use of this gas under the Montreal Protocol. Concentrations of the gas in the atmosphere should be going down at a rapid rate. But they're not, and a team of atmospheric scientists has been sniffing around to work out where the new sources of carbon tetrachloride are coming from and it鈥檚 China.

(Image: Earth from space, Credit: Getty Images.)