Turismo En España

Global warming is literally an increase in the Earth's average temperature. Global warming is brought about by the accumulation of greenhouse gases, or gases that allow sunlight to enter the Earthbut prevent heat from escaping it. The process by which these gases accumulate is known as the 'Greenhouse Effect.'
The greenhouse gases that contribute to global warming are produced through theburning of fossil fuels, like coal and oil, which are significant sources of the energy we use in everyday activities. The burning of fossil fuels, for example, helps produce the electricity needed forour homes to function. Unfortunately, the power plants that burn fossil fuels provide such a tremendous source of energy that they are also the largest source of greenhouse gases. In the U.S., thesecond largest source of greenhouse gases is automobiles.
Greenhouse gases are harmful to our environment not only because they increase the temperature of our planet, but because they are also a majorsource of air pollution. The burning of fossil fuels produces Carbon Dioxide, the major greenhouse gas, as well as other highly toxic pollutants such as Sulfur Dioxide, Nitrogen Dioxide, Ozone, andparticulate matter. These gases cause very serious health hazards such as asthma, bronchitis, emphysema, heart diseases, among others. Sadly, in the last ten years, we have experienced the largestaccumulation of carbon dioxide in our atmosphere since the first measurements were taken in 1960.  
Is It Happening?
Yes. Earth is already showing many signs of worldwide climate change.
• Averagetemperatures have climbed 1.4 degrees Fahrenheit (0.8 degree Celsius) around the world since 1880, much of this in recent decades, according to NASA's Goddard Institute for Space Studies.
• The rate ofwarming is increasing. The 20th century's last two decades were the hottest in 400 years and possibly the warmest for several millennia, according to a number of climate studies. And the United...