全球变暖.docx

Currently, there is sufficient evidence to show that human activity has led to the so-called "greenhouse gases" in the atmosphere accumulate , which makes global temperatures rising. Specific reasons for global warming ,
UN negotiations on climate change issues and consultations organized, IPCC by UNEP and the World Meteorological Organization was established in 1988, jointly organized . As a global network , the group has 2,500 world-class scientists and experts in the field of climate change research work carried out for review. In 2001 , due to have a new more powerful computer models , climate Panel further found that " the latest and most powerful evidence that global warming over the past 50 years mainly due to the activities of human beings too ."
IPCC scientists provides clear evidence of the following : 1992 target set by the " United Nations Framework Convention on Climate Change " To this end, the Convention on the approval of the country to meet again in 1997 in Kyoto, Japan , on a legally binding "Kyoto Protocol" agreement. According to this protocol , developed countries to emissions reductions in 1990 to establish a baseline level , will be held between 2008-2012 to reduce total emissions of six greenhouse gases by % .
Ozone is the upper atmosphere ( about 12-45 km above the ground ) in a thin gas layer . Ozone layer protects the Earth's surface , making