Global Warming of Lakes

Temperatures of the world's 167 largest lakes have increased by an average of 0.8 degrees Fahrenheit per decade during the past 25 years, according to NASA researchers using satellite data to measure surface temperatures.
Though the trend is global, it is more pronounced in the Northern Hemisphere; the most warming has occurred in northern Europe, note the researchers.
Water temperature changes affect such phenomena as algal blooms, which can make lakes toxic to native fish or more hospitable to invading nonnative species, the researchers warn.
SOURCE: National Aeronautics and Space Administration
http://www.nasa.gov/home/hqnews/2010/nov/HQ_10-308_Global_Lakes.html