Modern lives seem littered with expiration dates. Packaging tells us when our food will go bad; when we can expect appliances to cease functioning; when contracts for the internet finish! But as annoying as these small expiration dates are, they fade to nothing compared to the larger events: when a species goes extinct; when a body of water evaporates, or dies because the PH balance alters; when giant icebergs break apart and glaciers melt forever, threatening the ecosystem of this planet....