Working Group I: The Physical Science Basis
| The four SRES scenario families of the Fourth Assessment Report vs. projected global average surface warming until 2100 | ||
|
|
||
| Globalisation |
A1 1.4 - 6.4 °C |
B1 1.1 - 2.9 °C |
| Regionalisation |
A2 2.0 - 5.4 °C |
B2 1.4 - 3.8 °C |
The full WGI report was published in March 2007, and last updated in September of that year. It includes a Summary for Policymakers (SPM), which was published in February 2007, and a Frequently Asked Questions section.
This section of the report, Climate Change 2007: The Physical Science Basis, assessed current scientific knowledge of "the natural and human drivers of climate change" as well as observed changes in climate. It looked at the ability of science to attribute changes to different causes, and made projections of future climate change.
It was produced by 676 authors (152 lead authors, 26 review editors, and 498 contributing authors) from 40 countries, then reviewed by over 625 expert reviewers. More than 6,000 peer-reviewed publications were cited.
Before being approved, the summary was reviewed line by line by representatives of 113 governments during the 10th session of WGI, in January to February 2007.
On the issue of global warming and its causes, the SPM states that:
- "Warming of the climate system is unequivocal."
- "Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations."
Very likely and likely mean "the assessed likelihood, using expert judgment" are over 90% and over 66%, respectively.
Read more about this topic: IPCC Fourth Assessment Report
Famous quotes containing the words working, physical, science and/or basis:
“thanks to my friends for their care in my breeding,
Who taught me betimes to love working and reading.””
—Isaac Watts (1674–1748)
“Women generally should be taught that the rough life men must needs lead, in order to be healthy, useful and manly men, would preclude the possibility of a great degree of physical perfection, especially in color. It is not a bad reflection to know that in all probability the human animal has endowments enough without aspiring to be the beauty of all creation as well as the ruler.”
—Caroline Nichols Churchill (1833–?)
“Science is the language of the temporal world; love is that of the spiritual world. Man, indeed, describes more than he explains; while the angelic spirit sees and understands. Science saddens man; love enraptures the angel; science is still seeking, love has found. Man judges of nature in relation to itself; the angelic spirit judges of it in relation to heaven. In short to the spirits everything speaks.”
—Honoré De Balzac (1799–1850)
“The basis on which good repute in any highly organized industrial community ultimately rests is pecuniary strength; and the means of showing pecuniary strength, and so of gaining or retaining a good name, are leisure and a conspicuous consumption of goods.”
—Thorstein Veblen (1857–1929)