The document summarizes the Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) Working Group I, which addresses the scientific basis of climate change. The report was produced between 1998-2001 by over 100 lead authors, 500 contributing authors, and over 400 expert reviewers. It analyzes observations of a warming world and increasing greenhouse gases. The report assesses climate models and projects further temperature and sea level rise throughout the 21st century under different emissions scenarios. It aims to provide policymakers with the current scientific understanding of climate change and its uncertainties.
ESTO NO ES UNA LECTURA - ES UN TEXTO DE APOYO
Este es el resumen de políticas para de la comisión que analizo el Cambio Climatico en Copenhagen en 2007. Este informe es ENORME, pero tiene este breve resumen para personas que hagan políticas. Si les interesa, hojeenlo y descarguenlo. No hay puntaje ni actividad para este texto; pero es UTILISIMO y HERMOSO. Puede ser de mucha utilidad en los debates.
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ESTO NO ES UNA LECTURA - ES UN TEXTO DE APOYO
Este es el resumen de políticas para de la comisión que analizo el Cambio Climatico en Copenhagen en 2007. Este informe es ENORME, pero tiene este breve resumen para personas que hagan políticas. Si les interesa, hojeenlo y descarguenlo. No hay puntaje ni actividad para este texto; pero es UTILISIMO y HERMOSO. Puede ser de mucha utilidad en los debates.
mapc
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1. Climate change 2001:
The scientific basis.
Contribution of Working
Group I to the Third
Assessment Report of
the Intergovernmental
Panel on Climate Change
David J. Griggs and Maria Noguer
Met Office Hadley Centre, Bracknell
Background
The earth’s climate system has demonstrably
changed since the pre-industrial era, with some
of these changes attributable to human activ-
ities. The consequences of climate change pose
a serious challenge to policy-makers. Hence
they need an objective source of information
about climate change, its impacts and possible
response options. Recognising this, the World
Meteorological Organization (WMO) and the
United Nations Environmental Programme
jointly established the Intergovernmental Panel
on Climate Change (IPCC) in 1988. The terms
of reference of the IPCC include:
(i) to assess available scientific and socio-
economic information on climate
change and its impacts, and the
options for mitigating climate change
and adapting to it; and
(ii) to provide, on request, scientific/tech-
nical/socio-economic advice to the
Conference of the Parties to the
United Nations Framework Conven-
tion on Climate Change (UNFCCC).
The IPCC is organised into three Working
Groups and a task force on national green-
house inventories. Working Group I (WGI)
addresses the scientific aspects of the climate
system and climate change, Working Group II
(WGII) assesses the impacts of and adaptation
to climate change, and Working Group III
(WGIII) addresses the options for the mitigation
of climate change. From 1990, the IPCC has
produced three major Assessment Reports
(1990, 1996, and 2001), and Special Reports,
Technical Papers, methodologies and other
products that have been widely used by policy-
makers, scientists and other experts. More
information about IPCC can be found on the
IPCC website (http://www.ipcc.ch).
Components of the Third Assessment
Report
The WGI report (IPCC 2001) on the scientific
basis of climate change is the first part of Cli-
mate change 2001, the Third Assessment Report
(TAR) of the IPCC. Other companion assessment
volumes have been produced by WGII (Impact,
adaptation and vulnerability) and by WGIII
(Mitigation). As well as the underlying chap-
ters, each volume contains a ``Summary for
Policymakers’’ and a ``Technical Summary’’ to
maximise the ease of utility of the report. In
addition, a Synthesis Report has been pro-
duced, drawing from all IPCC reports scientific
and socio-economic information relevant to
nine questions addressing particular policy
issues raised by the UNFCCC.
Production of the WGI contribution to the
TAR
The WGI TAR was compiled between July 1998
and January 2001, by 122 lead authors. In
addition, 515 contributing authors submitted
draft text and information to the lead authors,
and 21 review editors oversaw the production
of the report. The draft report was circulated
for review to experts, with 420 reviewers sub-
mitting valuable suggestions for improvement.
This was followed by review by governments
and experts, through which several hundred
more reviewers participated. All the comments
received were carefully analysed and assim-
ilated into a revised document for considera-
tion at the session of the IPCC WGI held in
Shanghai, from 17 to 20 January 2001, with
delegates from 99 countries and 50 scientists
representing the lead authors. There the
``Summary for Policymakers’’, drafted by a
team of 59 authors, was approved word by
word, and the underlying report accepted.
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2. Scope of the WGI contribution to the TAR
The WGI TAR analyses the current body of
observations, which gives a collective picture of
a warming world. The TAR describes the
increasing concentrations of atmospheric
greenhouse gases and assesses the effects of
these gases and atmospheric aerosols in alter-
ing the radiation balance of the earth±
atmosphere system. The TAR assesses the
understanding of the processes that govern the
climate system and, by studying how well the
new generation of climate models represents
these processes, assesses the suitability of the
models for projecting climate change into the
future. A detailed study is made of human
influence on climate, concluding that there is
new and stronger evidence that most of the
warming observed over the last 50 years is
attributable to human activities. Projections of
future climate change are presented using a
wide range of scenarios of future emissions of
greenhouse gases and aerosols. Both tempera-
ture and sea-level are projected to continue to
rise throughout the twenty-first century for all
scenarios studied.
Finally, the report looks at the gaps in
information and understanding that remain
and how these might be addressed. All this
information is structured into 14 chapters with
881 pages in total (Table 1).
The TAR takes very seriously the uncertainty
that surrounds its findings and tries to consis-
tently indicate the degree of confidence of its
results by providing quantitative estimates of
uncertainty or estimating statistical significance
at the 0.05 (5%) level. Where this is not poss-
ible, the following words have been used where
appropriate to indicate judgmental estimates of
confidence: `virtually certain’ (greater than
99% chance that a result is true); `very likely’
(90± 99% chance); `likely’ (66± 90% chance);
`medium likelihood’ (33± 66% chance); `un-
likely’ (10± 33% chance); `very unlikely’ (1±
10% chance); `exceptionally unlikely’ (less
than 1% chance).
Table 1 Chapter structure of Climate change 2001: The scientific basis. Contribution of Working Group I to the
Third Assessment Report of the Intergovernmental Panel on Climate Change
Contents Co-ordinating Lead Contributing References
lead authors authors authors quoted
Summary for Policymakers Prepared by a team of 59 experts with contributions from
many authors and reviewers
Technical Summary 2 18 34 0
1 The Climate System: an Overview 1 3 0 5
2 Observed Climate Variability and Change 2 8 139 780
3 The Carbon Cycle and Atmospheric Carbon
Dioxide 1 9 49 482
4 Atmospheric Chemistry and Greenhouse Gases 2 10 57 291
5 Aerosols, their Direct and Indirect Effects 1 10 45 470
6 Radiative Forcing of Climate Change 1 8 32 391
7 Physical Climate Processes and Feedbacks 1 10 56 475
8 Model Evaluation 1 9 63 437
9 Projections of Future Climate Change 2 7 30 190
10 Regional Climate Information ± Evaluation
and Projections 2 7 49 368
11 Changes in Sea Level 2 6 28 290
12 Detection of Climate Change and Attribution
of Causes 2 4 28 168
13 Climate Scenario Development 2 4 6 254
14 Advancing our Understanding 1 3 0 20
Appendix I: Glossary 1 editor Many contributors 12
Appendix III: SRES Tables Contributions from many authors 4
Appendix III: Contributors to the IPCC WGI TAR
Appendix IV: Reviewers of the IPCC WGI TAR
Appendix V: Acronyms and Abbreviations
Appendix VI: Units
Appendix VII: Some Chemical symbols
Appendix VIII: Index
Note: Numbers do not match those in the text due to some authors contributing to more than one chapter.
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268
3. Final remarks
Finally, the TAR is:
(i) the most up-to-date description of the
knowns and unknowns of the climate
system and related factors;
(ii) based on the knowledge of the inter-
national expert communities;
(iii) produced by an open and peer-
reviewed professional process; and
(iv) based upon scientific publications.
In addition, the TAR findings are summarised
in terms useful to decision-makers. While the
assessed information is policy-relevant, the
IPCC does not establish or advocate public
policy.
Reference
IPCC (2001) Climate change 2001: The scientific basis.
Contribution of Working Group I to the Third Assess-
ment Report of the Intergovernmental Panel on Cli-
mate Change (Houghton, J. T., Ding, Y., Griggs,
D. J., Noguer, M., Van der Linden, P. J., Dai, X.,
Maskell, K. and Johnson, C. A. (Eds.)) Cam-
bridge University Press, Cambridge and New
York
Correspondence to: Dr D. J. Griggs, IPCC WGI Tech-
nical Support Unit, Met Office Hadley Centre,
London Road, Bracknell, Berkshire RG12 2SY.
e-mail: dave.griggs@metoffice.com
# Crown copyright, 2002.
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