Who better to paint a portrait of the world than a man who has gotten the very biggest of the "big picture" views? In a year-end video uploaded to YouTube Saturday, Canadian astronaut Chris Hadfield reflected on the state of the world and concluded we have much to be optimistic about. Sure, "there are problems with everything and nothing is yet perfect," he says, "but that shouldn't be cause to bemoan, that should be cause to achieve." Hadfield's video lays out a compelling case for the future of humanity.