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![Page 1: Climate Change and Planning of Cities: f indings from AR4 IPCC Prof Ogunlade R Davidson Co-Chair, IPCC Working Group III University of Sierra Leone Sustainable.](https://reader036.fdocuments.net/reader036/viewer/2022062800/56649e0c5503460f94af5630/html5/thumbnails/1.jpg)
Climate Change and Planning of Cities:
findings from AR4 IPCC
Prof Ogunlade R DavidsonCo-Chair, IPCC Working Group III
University of Sierra Leone
Sustainable Cities Summit
London, England 22 November, 2007
![Page 2: Climate Change and Planning of Cities: f indings from AR4 IPCC Prof Ogunlade R Davidson Co-Chair, IPCC Working Group III University of Sierra Leone Sustainable.](https://reader036.fdocuments.net/reader036/viewer/2022062800/56649e0c5503460f94af5630/html5/thumbnails/2.jpg)
Contents of Lecture
• About IPCC
• Introduction
• Science of Climate Change
• Adaptation to Climate Change
• Mitigation strategies
• Conclusions
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About the IPCC• Founded in 1988 by UNEP and WMO for providing the world policy
community with updated information on climate change• It assess research findings and undertake limited methodological work,
but do not make recommendations
• Assessment is based only peer-reviewed literature and limited grey literature under specific conditions
• Authors are from academic, industrial and NGO experts and fall into three categories
– Convening Lead Author (CLA)
– Lead Author (LA)
– Contributing Author (CA)
• Reviews by independent Experts and Governments
• Policy relevant, but NOT policy prescriptive
• Full report and technical summary: reviwed by experts and accepted by governments
• Summary for policymakers: government approval
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Working Group III
Mitigation
Netherland/Sierra Leone
WGIII co-chairs
Working Group I
ScienceUSA/China
WGI co-chairs
Working Group II Impacts and adaptation
UK/Argentina
WGII co-chairs
Task force on National GHG
Inventories
Japan/Brazil
NGGIP co-chairs
Over 3000 Experts, Authors, Contributors, Reviewers
Technical Support Unit
USA
Technical Support Unit
UK
Technical Support Unit
Netherlands
Technical Support Unit
Japan
IPCC Bureau
IPCC chair IPCC Secretariat WMO/UNEP
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IPCC First Assessmen
t Report
IPCC First Assessmen
t Report
IPCC Fourth
Assessment Report
IPCC Fourth
Assessment Report
IPCC Third Assessment Report
IPCC Third Assessment ReportIPCC Second
Assessment Report
IPCC Second Assessment
Report
Climate Climate +Impact+Impact
ss
Climate Climate +Impacts+Impacts
EfficiencyEfficiency
EquityEquity
Climate Climate +Impacts+Impacts
EfficiencyEfficiencyClimate Climate
+Impacts+Impacts
EfficiencEfficiencyyEfficiencEfficiencyy
SustainabilitSustainabilityy+Developme+Developmentnt
SustainabilitSustainabilityy+Developme+Developmentnt
EquityEquityEquityEquity
(Efficiency)(Equity) (Sustainability
+Development) (Sustainable
Development)
(Sustainable
Development)
Continuing FocusContinuing Focus
New FocusNew FocusNew FocusNew FocusEmerging FocusEmerging Focus
The Evolution of Ideas within the IPCC
The Evolution of Ideas within the IPCC
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The Climate Change is more a developmental than environmental Problem
• Carbon dioxide and other GHGs from fossil fuel combustion started in 1800s to present
• Concentration of GHGs causing warming of the earth• Significant increase in GHG emissions globally
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Observations: All major GHG concentrations has increased
since Pre-industrial CO2 grew from 280 ppm in 1750 to 379 ppm in 2005
Methane grew from 715 ppb in 1750 to 1774 ppb 2005
N20 grew from270 ppb in 1750 to 319 ppb in 2005
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OBSERVATION ON ATTRIBUTION
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• Projected warming in the 21st century is expected to be greatest over land and at most high northern latitudes, and least over the Southern Ocean and parts of the North Atlantic ocean
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Impacts will vary by extent of adaptation, rate of temperature change, and socio-economic development pathway
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Carbon dioxide is the largest contributor
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Transport Sector offer major opportunities
• As economic activities grow in cities so are their GHG emissions
• Motorisation dominates transport activity that create other problems –congestion and air-pollution
• Transport accounts for 23% of GHG emissions and have increased by 27% since 1990
• This sector has the highest growth
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Projected GHG and Mitigation Potential
• Current climate change mitigation policies and related sustainable development practices (SRES), could increase between 25-90% between 2000 and 2030
• Mitigation potential based on both bottom-up and top-down studies could offset the expected GHG emissions growth
• All sectors could contribute though their potential differ in quantity and sectors
Estimates do not include non-technical options such lifestyle changes
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Energy Supply Mitigation Technologies
NOW 2030
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Transport Mitigation TechnologiesNOW 2030
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Commercial mitigation technologies in the building sector
NOW 2030
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Changes in lifestyle and behaviour patterns can contribute to climate change mitigation
• Changes in occupant behaviour, cultural patterns and consumer choice in buildings.
• Reduction of car usage and efficient driving style, in relation to urban planning and availability of public transport
• Behaviour of staff in industrial organizations in light of reward systems
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Public Policies will be crucial • Returning global energy-related CO2 emissions to 2005
levels by 2030 would require a large shift in the pattern of investment
• Many barriers for implementing low-cost mitigation measures
• An effective carbon-price signal could realise significant mitigation potential in all sectors, hence policies are essential to create a carbon price (direct or indirect)
• The widespread diffusion of low-carbon technologies may take many decades, even if early investments in these technologies are made attractive.
• It is often more cost-effective to invest in end-use energy efficiency improvement than in increasing energy supply
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Climate Policy alone will not solve the climate change problem
• Macro-economic policy: taxes, subsidies, other fiscal policies, structural adjustment
• Trade policy: “embodied carbon”, removing barriers for low-carbon products, domestic energy sources
• Energy security policy : efficient energy use, domestic energy sources (low-high carbon)
• Access to modern energy: bio-energy, poverty tariffs• Air quality policy: clean fuel• Bank lending policies: lending for efficiency/ renewable
energy, avoid lock-in into old technologies in developing countries
• Insurance policy: Differentiated premiums, liability insurance exclusion, improved conditions for green products
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Non-climate policies can influence GHG emissions as much as specific climate policies
Sectors Non-climate policies -- Candidates for integrating climate concerns
Possible influence (% of global emissions)
Macro-economy Taxes, subsidies, other fiscal policies All GHG emissions (100 %)
Forestry Forest protection, sustainable management GHGs deforestation (7%)
Electricity Renewable energy, demand management, decreasing losses transport,/distribution
Electricity sector emissions (20 %)
Oil-imports Diversification energy sources/decrease intensity -> enhance energy security
GHGs from oil product imports (20 %)
Insurance buildings, infrastructure
Differentiated premiums, liability conditions, improved conditions green products
GHG emissions buildings, transport (20 %)
Bank lending Strategy/policy, lending projects accounting for options emission limitations
Notably development projects (25%)
Rural energy Policies promoting LPG, kerosene and electricity for cooking
Extra emissions over biomass (<2 %)
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Lower stabilisation level require global emissions to go down early
• Lower stabilization levels (550 ppm CO2-eq or lower) require major policies and government support: – RD&D efforts
– Investments in new technologies
– Tax credits
– Standard setting
– Technology development and transfer
– Market creation
• An effective carbon-price signal could realize significant mitigation potential
-5
0
5
10
15
20
25
30
35
2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Wo
ld C
O2
Em
iss
ion
s (
GtC
)
E: 850-1130 ppm CO2-eq
D: 710-850 ppm CO2-eq
C: 590-710 ppm CO2-eq
B: 535-590 ppm CO2-eq
A2: 490-535 ppm CO2-eq
A1: 445-490 ppm CO2-eq
Stabilization targets:
Post-SRES (max)
Post-SRES (min)
Eq
uil
ibriu
m g
lob
al
mea
n t
em
pera
tu
re
inc
rease
ove
r
pre
ind
us
tria
l(°C
)
GHG concentration stabilization level (ppmv CO2-eq)
-5
0
5
10
15
20
25
30
35
2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Wo
ld C
O2
Em
iss
ion
s (
GtC
)
E: 850-1130 ppm CO2-eq
D: 710-850 ppm CO2-eq
C: 590-710 ppm CO2-eq
B: 535-590 ppm CO2-eq
A2: 490-535 ppm CO2-eq
A1: 445-490 ppm CO2-eq
Stabilization targets:
Post-SRES (max)
Post-SRES (min)
Eq
uil
ibriu
m g
lob
al
mea
n t
em
pera
tu
re
inc
rease
ove
r
pre
ind
us
tria
l(°C
)
GHG concentration stabilization level (ppmv CO2-eq)
-5
0
5
10
15
20
25
30
35
2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Stabilization targets:
Post-SRES (max)
Post-SRES (min)
Eq
uil
ibriu
m g
lob
al
mea
n t
em
pera
ture
inc
rease
ove
r
pre
ind
us
tria
l(°C
)
GHG concentration stabilization level (ppmv CO2-eq)
-5
0
5
10
15
20
25
30
35
2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Stabilization targets:
Post-SRES (max)
Post-SRES (min)
Eq
uil
ibriu
m g
lob
al
mea
n t
em
pera
ture
inc
rease
ove
r
pre
ind
us
tria
l(°C
)
GHG concentration stabilization level (ppmv CO2-eq)
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Development path as important as specific climate mitigation policies
Development path with HIGH
base emissions
Development path with LOW
emissions
Climate policy can have Positive or negative effects
Non-climate policies
can influence GHG emissions
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Conclusions
• Global warming is equivocal and early action by governments are needed to reduce serious climate risks
• Large number of technologies are available now and in The near future to offset the GHG emissions
• Linking sustainable development aspirations with climate policies provide governments the opportunity to avert the possible climate threats
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Thank you for your attention
Further InformationContact
University of Sierra LeoneFreetown, Sierra Leone.Tel. No. 232-22-223340Fax. No 232-22-223270
Email: [email protected]