Sydney Morning Herald: Arctic permafrost melts. Methane frozen on the sea bed for thousands of years is starting to bubble to the surface as ice thaws. Photo: Unboxed Media The thawing of permafrost in one region of the Arctic will cause damage worth $65 trillion, or 80 per cent of the entire global economy last year, new research suggests. The oceans have been slowly warming in recent decades and methane frozen on the sea bed for thousands of years is starting to bubble to the surface in plumes. These ''methane pulses''...