Canberra Times: Global methane levels have jumped by almost 28 million tonnes in the past two years, and could accelerate the rate of climate change, according to new research. The methane spike, which began in mid-2006, appears to be generated by the rapid melting of ice across the Arctic circle, driven by hotter than average summer temperatures. ”It’s not good news for future global warming. It’s a big jump and we don’t know if it will continue,” CSIRO senior climate scientist Paul Fraser …