Agence France-Presse: Officials are considering a controlled burn of Louisiana’s fragile wetlands now soiled by heavy oil, the US Coast Guard said Thursday, stressing the move would be a last-ditch option. For the first time since an explosion rocked the Deepwater Horizon offshore oil platform a month ago and triggered a massive spill, Louisiana officials confirmed that heavy crude had reached the state’s coastline on Wednesday. But Coast Guard Captain Edwin Stanton, downplayed the impact as …