Winters are warming faster than summers in North America, impacting everything from ecosystems to the economy. Global climate models indicate that this trend will continue in future winters but there is a level of uncertainty around the magnitude of warming.   Researchers at UofNH focused on the role of carbon dioxide emissions in this equation—looking at the effects of both high and low levels of carbon dioxide emissions on future climate warming scenarios—and found that a reduction in emissions could preserve almost three weeks of snow cover and below freezing temperatures.   Researchers analyzed 29 different climate models to determine the effect of reducing carbon dioxide emissions, and other heat-trapping gasses, into the atmosphere. At the current pace, by mid-century (2040–2069) ski areas in North America will face up to a 50% decline in days where conditions would be favorable to make snow. Limiting emissions could slow that to only a 10 to 30% decline in the number of snowmaki...