NEW YORK (Reuters) - The extent of Arctic sea ice will likely have melted to a record low this September partially due to man-made greenhouse gas emissions, researchers at the University of Colorado said on Thursday. There is a 92 percent chance that Arctic sea ice extent in September will melt to its lowest level at least since the 1970s, when satellite measuring efforts began, the researchers said. They had predicted a 33 percent chance of a record low in April, but changed the forecast after a rapid disintegration of sea ice during July. Such high levels of ice melting...