Inter Press Service: Dan Bloom thinks it’s time to figure out how to build self-sustaining cities in the polar regions because climate change will eventually make most of Earth uninhabitable. These polar cities may be "humankind’s only chance for survival if global warming really turns into a worldwide catastrophe in the far distant future," Bloom told IPS. Bloom isn’t a scientist or any other kind of expert. A U.S. citizen in his late fifties living in Taiwan teaching English, he’s …