Reuters: Alarm bells are ringing about risks of a quickening thaw of Antarctica that would drive up world sea levels, Norway’s Prime Minister said on Sunday after a visit to the icy continent. Scientists say there are hard-to-quantify chances that newly detected lakes under Antarctica’s ice sheets might lubricate a slide towards the oceans, or that climate change could warm southern seas and melt floating sea ice holding back glaciers. "It is alarming. Alarm bells are ringing. It …