As climate change makes extreme weather events more intense and frequent, the world must spend hundreds of billions more a year - 10 to 18 times more than it currently spends - helping vulnerable people adapt to mounting devastation, United Nations experts said Thursday. The warning comes as millions of people suffer amid severe droughts, catastrophic wildfires and ruinous floods fueled by rising global temperatures. It also comes less than a month before the next U.N. Climate Change Conference,