Environment News Service: LONDON, UK, June 10, 2013 (ENS) -- The world is heading toward a skyrocketing global temperature increase of at least 3.6 degrees and up to 5.3 degrees Celsius, rather than the two degree Celsius increase that most scientists say is the safe upper limit, finds a report released today by the International Energy Agency. Today the IEA advanced four policies to keep the two degree goal alive. All are in the energy sector, which accounts for about two-thirds of the world`s greenhouse gas emissions....