BRUSSELS, Belgium - As the world gets hotter by degrees, millions of poor people will suffer from hunger, thirst, floods and disease unless drastic action is taken, scientists and diplomats warned Friday in their bleakest report ever on global warming. All regions of the world will change, with the risk that nearly a third of the Earth's species will vanish if global temperatures rise just 3.6 degrees above the average temperature in the 1980s-90s, the new climate report says. Areas that now have too little rain will become drier. Yet that grim and still preventable future is a toned-down prediction,...