Global warming over the past century is an objective and unequivocal fact generally recognized and accepted by international and scientific communities. The above-mentioned phenomena have been proved by the observations released by many international research institutes.
Radiosonde and satellite measurements of the temperature of the atmospheric layer of 8 to 12 km above the earth (i.e., troposphere) show warming rates that are consistent with those of the surface temperature record. The thermal expansion of seawater as ocean temperature warms has contributed to the continued rise of global average sea level, and the total sea level rise in the 20th century is estimated to be 0.17m. The snow cover in the Northern Hemisphere significantly shrunk, and mountain glaciers and Greenland ice sheets were melting at an accelerated speed. Average Northern Hemisphere temperature during the second half of the 20th century was likely the highest in the past 1300 years. Eleven years among 1995 to 2006 rank the 12 warmest years since the instrumental record.
Observations, impacts and future trends of global climate change: Observations indicate that global average surface temperature over the past century (1906 to 2005) increased by 0.74☌, and 0.65☌ for the period 1956 to 2005. Current research shows that global climate is mainly characterized by warming over the past 100 years meanwhile, there still remains great uncertainty in the science of climate change. It relates to the survival of the human beings and the development of all countries, and threatens social and economic development and people's livelihoods. Observed Changes in Climate and Their EffectsĬlimate change is a major global challenge facing the world today.
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