Global warming

earth’s climate

For 2.5 million years, the earth’s climate has fluctuated cycling from ages to warmer periods but in the last century the planets temperature has risen unusually fast about 1.2 to 1.4 degrees Fahrenheit. Scientists believe its human activities that are driving the temperature up a process known as global warming. The industrial revolution began factories power plants and eventually cars have burned fossil fuels such as oil and pull releasing huge amounts of carbon dioxide and other gases into the atmosphere. These greenhouse gases trap heat near the earth through a naturally occurring process called the greenhouse effect. The greenhouse effect begins with the sun and the energy it radiates to the earth the earth and the atmosphere absorbs some of this energy while the rest is radiated back into the space naturally-occurring gases in the atmosphere trap some of this energy and reflect back warming the earth. Scientists now believe that the greenhouse effect is being intensified by the extra greenhouse gases that humans have released evidence for global warming includes a recent string of very warm years. Scientists report that 1998 was the warmest year in measured history with 2005 coming in second meanwhile readings taken from ice cores show that the greenhouse gases carbon and methane have hit their highest levels in the past 420 thousand years. Arctic sea is also shrinking according to NASA studies the extent of Arctic sea ice has declined about 10 percent in the last 30 years as long as industrialized nations consume energy and developing countries increase their fossil fuel consumption. The concentration of greenhouse gases in the atmosphere will continue to rise researchers predict that atmosphere will increase about two to 10 degrees Fahrenheit by the end of the century what’s less certain is what rising temperatures mean for the planet some climate models predict subtle changes others forecast rising  sea levels which could flood coastal areas around the world weather patterns could change making hurricanes more frequent severe  droughts could become more common in warm areas and species unable to adapt to the changing conditions would face extinction although much remains to be learned about global warming many  organizations advocate cutting greenhouse gas emissions to reduce the impact of global warming consumers can help by saving energy around the house switching to compact fluorescent light bulbs and driving fewer miles in the car each week this simple changes may help keep the earth cooler in future.

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