Reuters: Scientists set off on a voyage to Antarctica on Saturday to see if the icesheets at the edge of the vast continent are melting faster and whether the Southern Ocean is soaking up less climate-warming carbon dioxide. The Southern Ocean absorbs a large amount of the CO2 emitted by industry, power stations and transport, acting as a brake on climate change. "Some recent results suggest the Southern Ocean is becoming less effective at absorbing CO2 than it used to be," …