Sign of Global Warming that have been Stated by Scientists and Researchers.
Climate scientists agree that the global average surface temperature has risen over the last century. Within this general agreement, some individual scientists disagree with the scientific consensus that most of this warming is attributable to human activities. The scientific consensus was summarized in the 2001 Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) as follows:
1. The global average surface temperature has risen 0.6 ± 0.2 °C since the late 19th century, and 0.17 °C per decade in the last 30 years.
2. "There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities", in particular emissions of the greenhouse gases carbon dioxide and methane.
3. If greenhouse gas emissions continue the warming will also continue, with temperatures projected to increase by 1.4 °C to 5.8 °C between 1990 and 2100. Accompanying this temperature increase will be increases in some types of extreme weather and a projected sea level rise of 9 cm to 88 cm, excluding "uncertainty relating to ice dynamical changes in the West Antarctic ice sheet". On balance the impacts of global warming will be significantly negative, especially for larger values of warming.
hose listed here have, since the Third Assessment Report of the IPCC, opposed at least one of these principal conclusions. Inclusion is based on specific, attributable statements in the individual's own words, and not on listings in petitions or surveys. For the purpose of this list a "scientist" is an individual who has published at least one peer-reviewed article during their lifetime in the broadly-construed area of natural sciences, though not necessarily in recent years nor in a field relevant to climate.
In February 2007, the IPCC released a summary of a Fourth Assessment Report, which contains similar conclusions. In judging...