IPCC Assessment Report Four

1. .
Agriculture and Forestry University
Faculty of Forestry
GRADUATE SEMINAR
Climate Change and Impacts
on Natural Resources
Manoj Neupane
Roll No. : 15
M.SC. Forestry (2075-2077)
31 Aug. 2019, Hetauda
IPCC Assessment Report Four

2. Introduction
2
• Intergovernmental Panel on Climate Change(
IPCC) is an intergovernmental body of the
United Nations, dedicated for understanding,
mitigating and adapting from the Impact of
Climate Change.
• Establised in 1988 by WMO and UNEP and
later endorsed by United Nations General
Assembly.
• It produces reports that contribute to the work
of UNFCCC.It DOESN'T carry out original
research nor does it monitor climate or
related phenomena itself.
• It assesses published from peer-reviewed
and non-peer reviewed sources.

3. Introduction....
3
UN parent
organization
Intergovernmental
panel
(195 member state)
International scientist
and experts
Structure of IPCC
(IPCC, 2007d)

4. Objectives
4
• To Understand the IPCC Assessment Report
Four

5. Methodology
5
Secondary data
• Different working groups reports of IPCC
• Other related materials from different
sources
• Consultation with the experts on the field

6. Finding and Discussion
6
• AR 4 was published in 2007. It consist of four reports,
3 working group and 1 synthesis report.
• More than 3000 experts and authors from over 130
countries had contributed citing over 6000 peer-
reviewed scientific studies.
• IPCC has highest international credibility in terms of
CC science.
• AR 4 describes
warming and cooling
effects on the planet
in terms of radiative
forcing - the rate of
change of energy in
the system.
(IPCC, 2007d)

7. Finding and discussion
WG I
• Warming of the climate system is unequivoval ( Global average
air and ocean temperature and sea level )
• Most of the warming over the past 50 years is very likely due to
human activities.
WG II
• Impacts will very likely increase due to increased frequencies
and intensities of some extreme weather events.
• More extensive adaptation measure is required to reduce
vulnerability to CC
WG III
• Warming would continue for centuries even if GHG emissions were to be
reduced sufficiently (Stabilization of atmospheric Green house gas )
• Unmitigated climate change, in long term, be likely to exceed the capacity
of natural, managed and human sysem to adapt
• Many impact can be REDUCED, DELAYED OR AVOIDED by mitigation.
7
(IPCC, 2007a; 2007b, 2007c)

8. 8
Finding and discussion
• CO2 379 ppm (2005); 180 (650000 yr ago)
• CH4 from around 500 ppb to 1774
• Global average temperature increase of 0.74o C (100 yr)

9. 9
Criticism
• Sea level rise less than the previous
projection (TAR).
• IPCC was too conservative in its
estimamates of potential harm from climate
change.
• The report has also been critised for
inclusion of an erroneous data for the
projected demise of the HImalayan
Glaciers.

10. Conclusion
10
• CO2 level in atmosphere is unprecendented in the
last 650,000 years
• Warming of the climate system is Unequivocal
• Future Climate change include : more extremes,
wetter in high latitudes, drier in subtropics

11. Personal Observation
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• Most of the global warming of the past is due
to increases in GH gases
• Climate change is real and is happening and
is here to stay
• Humans now control the mechanism for global
climate change for better or worse.

12. Reference
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IPCC. (2007a). Climate Change 2007 : Mitigation. Contribution of Working
Group III to the Fourth Assessment Report of the Intergovernmental
Panel on Climate Change. Cambridge, United Kingdom and New
York, NY, USA., XXXpp.: Cambridge University Press.
IPCC. (2007b). Climate Change 2007 : Impacts, Adaptation and
Vulnerability. Contribution of Working Group II to the Fourth
Assessment Report of the Intergovernmental Panel on Climate
Change, M.L. Parry, O.F. Canziani, P.J. van der Linden and C.E.
Hanson,eds. Cambridge, UK: Cambridge University Press.
IPCC. (2007c). Climate Change 2007 : The Physical Science Basis.
Contribution of Woking Group I to the Fourth Assessment Report of
the Intergovernmental Panel on Climate Change. Cambridge UK:
Cambridge University Press.
IPCC. (2007d). Climate Change 2007 : Synthesis Report. Contribution of Working
Groups I, II and III to the Fourth Assessment Report of the
Intergovernmental Panel on Climate Change. Switzerland: IPCC
IPCC. (2007e, August 25). Retrieved from www.ipcc.ch/assessments-
reports.htm