What is Global Warning ?
The global average air temperature near the Earth's surface rose 0.74 0.18 C (1.33 0.32 F) during the 100 year period ending in 2005. The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations" via the greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward. These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. While individual scientists have voiced disagree ...more
The global average air temperature near the Earth's surface rose 0.74 0.18 C (1.33 0.32 F) during the 100 year period ending in 2005.