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[00:01.00]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.
[00:14.68]Some scientists say the findings provide more evidence that the Earth is getting warmer.
[00:22.86]The findings were reported by John Magnuson and a research team from the University of Wisconsin,in Madison.
[00:33.02]The researchers collected historical information from Eighteen-Forty-Six to Nineteen-Ninety-Five about twenty-six lakes and rivers.
[00:44.23]The lakes and rivers are in the United States,Canada,Russia,Japan,Finland and Switzerland.
[00:53.45]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.
[01:06.54]They say those changes would mean a rise in air temperatures around the world of almost two degrees Celsius every one-hundred-fifty years.
[01:18.89]Scientists say even small changes in the Earth's temperature can have serious effects on the environment.
[01:28.17]Most scientists think the Earth is getting warmer and that people are causing the problem.
[01:35.38]They say people are burning more fuels that trap heat in the atmosphere,such as coal and oil.
[01:44.55]But some scientists say global warming is not real.
[01:49.69]They say it is part of the natural system unaffected by human action.
[01:56.41]The new results alone do not prove that the Earth's temperature is rising or that people are causing it.
[02:05.63]But scientists say their findings support the idea that the Earth is getting warmer.
[02:13.80]The researchers collected information from historical records.
[02:18.90]They got the information from newspaper reports,fur traders' records,ship navigation records and notes of religious events.
[02:29.55]They discovered the dates of ice formation and breakup on three continents since Eighteen-Forty-Six.
[02:37.73]Some of the information was recorded because rivers and lakes were important for trade or transportation.
[02:46.90]People also took note of freezing or thawing as a sign of the seasons.
[02:54.11]The researchers note that the changes in ice formation on the lakes and rivers appear to have begun before Eighteen-Forty-Six.
[03:05.19]But they say the changes were happening at a slower rate then.
[03:10.46]They say most warming during the past one-hundred-fifty years is probably the result of human activity.
