Sharm el Sheikh (Egypt) (AFP) – On the hunt for the methane “super-emitters”, US President Joe Biden on Friday unveiled a plan to plug oil and gas leaks and tighten regulation as several global emitters vowed to step up efforts to slash pollution of the powerful greenhouse gas. Methane, released from the oil and gas, waste and agriculture sectors as well as through natural processes, is responsible for roughly 30 percent of the global rise in temperatures to date. Dozens of countries have signed up to cutting their emissions of the short-lived but potent gas by a third this decade and Biden …