What do experts think about global warming?

Answer 1

Climate Scientists all over the world are the experts on Global Warming. What they think about it is summarized below:

The InterGovernmental Panel on Climate Change (IPCC) was set up by the United Nations to examine and analyze all the peer-reviewed climate studies all over the world and assess them.

Their latest report: Fourth Assessment Report "Climate Change 2007" confirms what their earlier reports had found, that emissions of heat-trapping greenhouse gases like carbon dioxide from the burning of fossil fuels was 90 to 99% likely to be causing the global warming that has been observed over the past 50 years.

The US Global Change Research Program reported in June 2009:

Observations show that warming of the climate is unequivocal. The global warming observed over the past 50 years is due primarily to human-induced emissions of heat-trapping gases. These emissions come mainly from the burning of fossil fuels (coal, oil, and gas), with important contributions from the clearing of forests, agricultural practices, and other activities.

The Arctic Council and The International Arctic Science Committee reported in 2004 in their Arctic Climate Impact Assessment:

Climate conditions in the past provide evidence that rising atmospheric carbon dioxide levels are associated with rising global temperatures. Human activities, primarily the burning of fossil fuels (coal, oil, and natural gas), and secondarily the clearing of land, have increased the concentration of carbon dioxide, methane, and other heat-trapping ("greenhouse") gases in the atmosphere...There is international scientific consensusthat most of the warming observed over the last 50 years is attributable to human activities.

• In 2001, 17 National Science Academies issued a joint statement regarding anthropogenic (man-made) global warming and urged people everywhere to reduce greenhouse gas emissions. This was signed by the National Science Academies of Australia, Belgium, Brazil, Canada, the Caribbean, China, France, Germany, India, Indonesia, Ireland, Italy, Malaysia, New Zealand, Sweden, Turkey, and the United Kingdom.
• In 2005, the Science Academies of Brazil, Canada, China, France, Germany, India, Italy, Japan, Russia, the United Kingdom, and the United States issued a similar joint statement.
• In 2007, following the 4th Report of the IPCC, a statement of support was signed by the National Science Academies of Brazil, Canada, China, France, Germany, Italy, India, Japan, Mexico, Russia, South Africa, the United Kingdom, and the United States.
• In 2008, in preparation for the G8+5 Meeting, the same thirteen countries issued a statement affirming "that climate change is happening and that anthropogenic warming is influencing many physical and biological systems."
• In 2009, the same thirteen countries affirmed that "climate change is happening even faster than previously estimated; global CO2 emissions since 2000 have been higher than even the highest predictions, Arctic sea ice has been melting at rates much faster than predicted, and the rise in the sea level has become more rapid."