Temperature Changes So

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Temperatures vary naturally from year to year, but most climate scientists agree that average global temperatures have risen about 1.1 degrees Fahrenheit (0.62 degree Celsius) during the last century, with two-thirds of this warming occurring since the 1970s. Temperatures have warmed on land more than in the oceans, and land surface temperature measurements (available since 1860) indicate that the 1990s was the warmest decade ever. In fact, according to the IPCC, eleven of the last twelve years were among the twelve hottest years on record.

In the United States, the consensus view is that average temperatures rose approximately 1 degree Fahrenheit (0.56 degree Celsius) during the last century. Most of this warming has occurred in the winters, and certain parts of the country such as the coastal Northeast, the upper Midwest, the Southwest, and

Alaska grew much hotter than the 1-degree average. According to past weather data, 1998 was the hottest year in world history, but according to the National Climatic Data Center (NCDC), an organization run by the U.S. Department of Commerce that collects climate data, 2006 was the warmest year on record for the United States.

These conclusions about temperature increases may be somewhat exaggerated, however. In 2007, for example, the National Aeronautics and Space Administration (NASA) revised its official

Drought and weeks of extreme heat cause thousands of dead fish to line the shore of Jackson Lake in Franklin, Tennessee, in August 2007. Many climate scientists agree that average global temperatures have risen about 1.1 degrees Fahrenheit (0.62 degree Celsius) during the last century, with two-thirds of this warming occurring since the 1970s.

Drought and weeks of extreme heat cause thousands of dead fish to line the shore of Jackson Lake in Franklin, Tennessee, in August 2007. Many climate scientists agree that average global temperatures have risen about 1.1 degrees Fahrenheit (0.62 degree Celsius) during the last century, with two-thirds of this warming occurring since the 1970s.

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records of surface temperatures in the United States. As global warming critic Joseph Blast of the Heartland Institute explains: "The revised data show 1998 falling to second place behind 1934 as the warmest year, followed by 1921, 2006, 1931, 1999, and 1953. Four of the top 10 years on record are now from the 1930s . . . while only three of the top 10 (1998, 2006, 1999) are from the past 10 years."15 Other critics have suggested that worldwide temperatures during the 1990s may have recorded hotter than past decades because hundreds of measuring stations were shut down in cold regions of the world, such as the Soviet Union. Also, critics say, many once-rural measuring stations may have been surrounded by urban sprawl—suburban developments with numerous roads and concrete parking lots that are known to absorb more sunlight and become much hotter than the countryside.

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Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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