President Obama is painting a global warming doomsday scenario

President Barack Obama is painting a doomsday scenario for the Arctic and beyond if climate change isn't dealt with fast: entire nations submerged underwater, cities abandoned and refugees fleeing in droves as conflict breaks out across the globe.

It's a harrowing image of a future that Obama insists is inevitable unless the world follows his and America's lead by making sweeping cuts to greenhouse gases. Lest his sense of urgency get lost, Obama was to drive the message home on Tuesday by hiking a melting glacier in Alaska.

Obama is counting on Alaska's exquisite but deteriorating . . .