Winnipeg Free Press: When it comes to global warming, even the good news may not be all that great in the end. After a devastating melting of Arctic ice in 2007, researchers were cautiously optimistic when the ice surface area actually grew in 2008. But University of Manitoba scientist David Barber says the growth was mostly thin, first-year ice, which is more likely to melt during the summer. The amount of thicker multi-year ice — which once covered the entire Arctic basin before it began …