Reuters: Environmentalists plan to block one of two rail lines into the world’s biggest coal export port in Australia at the weekend, amid wrangling by rich nations over efforts to combat climate change, they said on Tuesday. Any disruption to coal shipments from the Newcastle port could give another boost to benchmark coal prices that are already near record highs at nearly US$195 a tonne, having more than trebled in a year. Up to 1,000 protesters are planning on Sunday to block the …