GLOBAL WARMING
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for two point five milion years the earth climate has fluctuated
cycling from ice ages to warm aparience
but in the las century the planets temperature has risen unusually fast
about one point two to one point four degrees fahrenheit scientists believe
its human activity that´s driving the temperatures up
a process known as global warming
ever since the industrial revolution began
factories power plants and eventually cards burn fossil fuels such as oil and coal
realising huge amounts of carbon dioxide and other gases into the atmosphere
these greenhouse gases trapping near the earth naturally occurring process called the greenhouse effect
the greenhouse effect begins with the sun and energy radiates to the earth
the earth and the atmosphere absorb some of this energy while the rest is radiated back into space
naturally occurring gases in the atmosphere track some of this energy and reflected back
warming the earth scientists now believe that the greenhouse effect is being intensified by the extra greenhouse gases the humans every least
evidence for global warming includes a recent string of everyone years
scientists reported in nineteen ninety eight was the warmest year in measured history with two thousand five coming in second
meanwhile readings taken from score show that the greenhouse
gases the carbon dioxide and methane highest levels in the past four hundred and twenty thousand years
arctic sea ice is also shrinking according to nasa studies the extend of artic sea
ice has declined about ten percent in the last thirty years
as long as industrialized nations consume energy
and developing countries increased their fossil fuel consumption
the concentration of greenhouse gases in the atmosphere will continue to rise
researchers predict that temperatures will increase about two to ten 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 changing conditions would face extintion
although much remains to be learned about the global warming
many organizations advocates cutting greenhouse gas emissions to reduce impact to global warming
consumers can help
by saving energy around the house switching to compact fluorescent light bulbs
and driving miles in the car industry
this simple changes maid help in the future