A climate negotiator from the Philippines, which is mopping up the devastation of Typhoon Haiyan, pledged Monday to fast at UN talks in Warsaw until clear progress is made in the fractious process. "In solidarity with my countrymen who are struggling to find food back home and with my brother who has not had food for the last three days... I will now commence a voluntary fasting," envoy Naderev Sano said as the 12-day talks opened to discuss ways of curbing climate-altering greenhouse gas emissions.