COLOMBO — Stuck in the long lines of vehicles queuing up for what little, and expensive, fuel is available at Sri Lanka’s beleaguered gas stations are the SUVs bearing the sign of the Department of Wildlife Conservation (DWC). It’ll be three or four hours before they get their turn at the pump. If they’re lucky, there will still be some fuel left, but it will be rationed out. More likely than not, they’ll have to return running on fumes. The rangers responsible for these SUVs, whose job it is to patrol Sri Lanka’s national parks, are among the millions of Sri Lankans experiencing the worst eco…