A historic 52 million people are fleeing conflict worldwide, a trend that will intensify over the next two decades because of climate change, International Rescue Committee chief David Miliband said on Friday. "One of the drivers of displacement and potential conflict over the next 10 to 20 years will be climate (change) - resource scarcity," said Miliband, a former United Kingdom foreign minister. Miliband said there were 16 million refugees and 36 million people displaced in their own countries, typically by civil war. That is the largest number of people fleeing persecution since World War Two, he said during a Reuters Newsmaker event in New York. "Do I think the current level is a blip or a trend?" Miliband said.