Bbc Inside Science

New CFC emissions Researchers say that they have pinpointed the major sources of a mysterious recent rise in a dangerous, ozone-destroying chemical. CFC-11 was primarily used for home insulation but global production was due to be phased out in 2010. But scientists have seen a big slowdown in the rate of depletion over the past six years. This new study published in the Journal Nature says this is mostly being caused by new gas production in eastern provinces of China. Dr Matt Rigby of the University of Bristol and the BBC’s Matt McGrath, who has also been following the trail, tell Gareth about the mystery.Yeast to make cannabinoids In California, where cannabis has become a major cash crop since legalisation there, researchers are trying to evaluate the environmental impacts of large scale agricultural planting. But, as Geoff Marsh reports, other researchers are finding other ways to produce various cannabinoids for potential future sale. Can humble yeast be modified to produce the active substances that som