Climate News Network: There is fresh concern among scientists over the rises they are detecting in one of the chief greenhouse gases, methane.
A team of researchers from universities in Sweden and the US says methane is increasing in the atmosphere fast enough for emissions of the gas possibly to rise by between 20% and 50% before the end of the century.
Over a century, methane is 25 times more powerful as a greenhouse gas than carbon dioxide, the main gas contributing to global warming. But over a 20-year period,...