On debates concerning the global warming

Some problems in the global climate studies are discussed in this manuscript Special attention was given to the debates on global warming Although it is widely accepted that the anthropologic greenhouse effect would be responsible for the recent global warming, there are always unceasing skepticism Numerous evidences show that it is indubitable on the climate warming itself The global surface air temperature has increased by 0 4-0 8℃ since the mid 19th century Substantial changes associated with the climatic warming also occurred during the past century These related transformations have been observed in the ocean temperature, atmospheric temperature, reconstructed temperatures from the evaluation of mountain snowlines and borehole thermometry, land snow cover, sea ice cover and the mountanious glaciers It is found that 1998 is the warmest year on records during the past 150 years Global averaged annual temperature in 1998 is 0 55℃ above the mean of 1961-1990 The linear warming trend for the 20th century is 0 066℃ /10a The 1990s (with the anomaly of +0 35℃ ) is the warmest decade not only in the 20th century but also in the past 500 years and maybe even in the last millennium After all, the global warming in the 20th century is an explicit fact, whereas there are doubts on which factor should be responsible for it Anthropologic factor may be the most important reason, at least, may be one of the most important factors if there are some other crucial causes To some degree, the sciences of climate change benefit from the debates on the global warming , since there are increasing concerns and demands for a better understanding of the climate system (including their natural variability and their interaction with the human induced greenhouse effects) Unfortunately, the debates and some related conclusions are no more “pure” scientific questions, but political affairs.