Washington Post: President Obama joined leaders from 150 nations on Monday in pledging action against climate change, kicking off a historic two-week gathering that Obama called a turning point in the battle against one of humanitys gravest threats.
Heads of state from industrial powers and tiny island nations assembled in a heavily guarded conference center north of Paris, where negotiators hope to forge a treaty to dramatically reduce emissions of greenhouse-gas pollution blamed for warming the planet.
Obama,...