                    Global Warming  

    A new study says that lakes and rivers in North America, Asia and Europe are freezing later and melting earlier than they did many years ago. Some scientists say the findings provide more evidence that the Earth is getting warmer.  
    The findings were reported by John Magnuson and a research team from the University of Wisconsin, in Madison. The researchers collected historical information from 1846 to 1995 about twenty-six lakes and rivers. The lakes and rivers are in the United States, Canada, Russia, Japan, Finland and Switzerland.   
    The researchers found that many lakes and rivers were freezing about nine days later and thawing about ten days sooner than they did one-hundred-fifty years ago. They say those changes would mean a rise in air temperatures around the world of almost two degrees Celsius every one-hundred-fifty years.  
