It's circa 2050 and shoppers are stopping off at Ikea to buy fine wine made in Sweden. A Nordic fantasy? Not according to climate experts who say the Earth's warming phase is already driving a wave of change through the world of wine. As new frontiers for grape growing open up, the viability of some traditional production areas is under threat from scorching temperatures and prolonged droughts. And in between the two extremes, some long-established styles are being transformed. Some whites once renowned for being light and crisp are getting fatter and more floral while medium-bodied reds are morphing into heavyweight bruisers. "Some people are alarmists, I prefer to be an optimist," says Fernando Zamora, oenology researcher and professor at Rovira i Virgili University in Tarragona, Spain.