BELEM, Brazil (AP) — Global efforts to curb emissions of the potent but short-lived heat-trapping gas methane are doing about as poorly as the more prevalent carbon dioxide , but there’s hope for the next five years, U.N. officials said Monday. Methane emissions can be a “hand brake” for slowing greenhouse gas pollution and temperatures, said Martina Otto, head of the U.N.'s climate and clean air commission for methane pollution. That’s because methane from fossil fuels traps nearly 30 times