United Nations Framework Convention on Climate Change" (UNFCCC) in the first paragraph， the words "climate change" is defined as: "After a considerable period of time of observation， in addition to natural climate change by human activities， either directly or indirectly caused by changes in global atmospheric composition of climate "UNFCCC will therefore be a result of human activities change the atmospheric composition of the" climate change "and attributed to natural causes" climate variability "to Climate change (climate change) are mainly manifested in three areas: global warming (Global Warming)， acid rain (Acid Depostion)， ozone depletion (Ozone Depletion)， in which global warming is mankind's most pressing problems related to human Future! Caused by climate change， what are the reasons? Climate change may be due to natural internal processes or external forcing， or artificially sustained components of the atmosphere and land-use Both natural factors， but also some of the In the man-made factors， mainly due to human activities since the Industrial Revolution， especially the process of industrialization in developed countries caused by economic Fossil fuel burning and deforestation， land-use change， greenhouse gas emissions from human activities led to a substantial increase in atmospheric greenhouse gas concentrations， enhance the greenhouse effect， causing global According to the US Oak Ridge laboratory studies report that since 1750， global cumulative emissions of more than 1 trillion tons of carbon dioxide emissions in developed countries which account for about 80% What are the implications of climate change will bring? Climate change， leading to frequent catastrophic weather events， accelerated melting of glaciers and snow cover， water distribution imbalances， biodiversity is under Climate change is also caused by sea-level rise， coastal areas subject to floods， storms and other natural disasters is even more serious， small island states and low-lying coastal areas even facing the threat of being Of climate change on agriculture， forestry， animal husbandry， fishery and other economic and social activities will have a negative impact， exacerbating the spread of disease， threatening the socio-economic development and people's According to the Intergovernmental Panel on Climate Change report， if temperatures rise by more than 5 ℃， all regions are vulnerable to the adverse effects of the loss suffered particularly severe in developing countries; if temperature 4 ℃， the global ecosystem may not cause any irreversible damage， causing heavy losses to the global According to China in 2006 "issued by National Assessment Report on Climate Change，" the impact of climate change on China's focus on agriculture， water resources， natural ecosystems and coastal zones， ， may lead to increased instability in agricultural production， flooding the southern region heavier the north intensified conflicts between water supply and demand， forest and grassland ecosystems， such as degradation， biological disasters hair， reduction of biodiversity， frequent typhoons and storm surges， coastal zone disaster intensified on major project construction and operation of security has been affected
The Four seasons-四季 The Four seasonsA year has four Every season has three The weather of one season is different from that of any The life cycles of plants are controlled by the The first season is The three months in it are March， April and M During that time we have warm weather and fine All plants come to Animals wake up from It is time for farmers to get ready for their The second season is The three months are June， July and A The weather is very hot and it often People can go swimming and It is time for all things to grow The third season is The three months are September， October and N The weather becomes cooler and Leaves begin to fall to the It is the harvest time for The fourth season is December， January and February are the three months of that The weather is very cold， and most of the plants die at that Sometimes it People can enjoy skating and But winter doesn' t stay with us for a long time， for spring comes again soon
