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[00:01.00]Scientists have long believed that reducing carbon dioxide gas in the atmosphere is the best way to slow the warming of the Earth.
[00:11.68]But new research suggests that reducing other gases may be a more effective way to slow climate change.
[00:20.41]The study was presented by American space agency scientist James Hansen and a team of scientists at NASA's Goddard Institute for Space Studies.
[00:32.19]They say that carbon dioxide levels have remained about the same during the past twenty-five years.
[00:40.23]Yet they say the average temperature of the Earth's surface has increased.
[00:47.29]The researchers found that the combination of other so-called greenhouse gases traps more heat in the atmosphere than once thought.
[00:58.10]Such gases include methane,chlorofluorocarbons and ozone gases.
[01:05.10]The new research suggests that limiting carbon dioxide and other gases is the best way to prevent the Earth from getting too warm.
[01:16.83]Carbon dioxide in the atmosphere traps heat and keeps it near the Earth's surface.
[01:24.93]It is produced by burning fuels that contain carbon such as coal,oil and wood.
[01:33.16]Three years ago,one-hundred industrial nations signed an agreement designed to reduce carbon dioxide levels in the air by the year Two-Thousand-Twelve.
[01:47.31]However,many countries objected to the climate change treaty.
[01:52.51]They said efforts to meet the goals of the treaty would harm their industries.
[01:59.07]The NASA scientists say more efforts should be made to limit the other gases.
[02:05.91]They say other greenhouse gases appear to trap more heat in the atmosphere than carbon dioxide.
[02:15.08]And technologies already exist to control most other greenhouse gases.
[02:22.74]NASA scientists say reductions in methane,ozone and black carbon gases also would improve public health and agricultural productivity.
[02:35.62]And they say the cuts would help the world'climate and improve the air.
[02:41.78]Representatives of industries most affected by restrictions on carbon dioxide welcomed the findings.
[02:50.01]But some scientists fear the study might be used to ease pressure on industrial nations that produce more carbon dioxide.
[03:00.20]Others say it might be used to pressure developing countries to do more to control the release of harmful gases.
[03:10.36]But most scientists agree that reductions are needed in all areas to prevent further global warming.
