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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

Video Details

Duration: 3 minutes and 4 seconds
Country: Spain
Language: English
Genre: None
Views: 148
Posted by: jaasoon on Nov 2, 2011

National Geographic

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