IPCC Fifth Assessment Report Synthesis Report2014/12/25  · IPCC AR5 Synthesis Report IPCC Fifth...

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IPCC AR5 Synthesis Report IPCC Fifth Assessment Report Synthesis Report Prof. Dr. FredolinTangang IPCC WG1 ViceChair IPCC AR5 Synthesis Report Outline Introduction to IPCC: Organization structure and roles Key messages of AR5 SYR Observed changes in physical climate & human influence attribution Observed impacts of climate change Projected climate change and potential impacts Options in limiting future climate change

Transcript of IPCC Fifth Assessment Report Synthesis Report2014/12/25  · IPCC AR5 Synthesis Report IPCC Fifth...

Page 1: IPCC Fifth Assessment Report Synthesis Report2014/12/25  · IPCC AR5 Synthesis Report IPCC Fifth Assessment Report Synthesis Report Prof. Dr. FredolinTangang IPCC WG1 Vice‐Chair

IPCC AR5 Synthesis Report

IPCC Fifth Assessment ReportSynthesis Report

Prof. Dr. FredolinTangang

IPCC WG1 Vice‐Chair

IPCC AR5 Synthesis Report

Outline

• Introduction to IPCC: Organization structure and roles

• Key messages of AR5 SYR• Observed changes in physical climate &

human influence attribution• Observed impacts of climate change• Projected climate change and potential

impacts• Options in limiting future climate change

Page 2: IPCC Fifth Assessment Report Synthesis Report2014/12/25  · IPCC AR5 Synthesis Report IPCC Fifth Assessment Report Synthesis Report Prof. Dr. FredolinTangang IPCC WG1 Vice‐Chair

IPCC AR5 Synthesis Report

Inter‐governmental Panel on Climate Change (IPCC): Organization Structure

• IPCC plenary comprises of all countries in the world

• IPCC Bureau comprises of 30 elected members; IPCC elects its bureau members once in a 6‐7 years cycle

• 3 working groups & a Task Force on NGGI

• Authors, Contributors, Reviewers, Review Editors

IPCC AR5 Synthesis Report

IPCC Organization Structure

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IPCC AR5 Synthesis Report

Why IPCC?

• Prior to the establishment of IPCC, growing number of literatures indicate the Earth’s climate system is warming due to increasing GHG concentration in atmosphere

• Independent, objective, fair and transparent assessment of the state of global climate system is required

• For this reason, United Nations General Assembly (UNGA) 42 proposed the establishment of IPCC and in 1988 IPCC was established under WMO and UNEP

• The IPCC provides such assessment and this becomes the source of information particularly to policy makers and UNFCCC on 1. Causes of climate change, 2. Potential impacts on built and natural systems and socio-economic, 3. Possible response options.

IPCC AR5 Synthesis Report

IPCC Assessment Reports

FAR 1990 SAR 1995 TAR 2001 AR4 2007

AR5 WGII 2014AR5 WGI 2013 AR5 WGIII 2014

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IPCC Assessment Process

IPCC assessment is based on available peer‐reviewed publications

IPCC AR5 Synthesis Report

AR5 WGII 2014

AR5 WGI 2013

AR5 WGIII 2014

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IPCC AR5 Synthesis Report

Key Messages

➜ Human influence on the climate system is clear

➜ The more we disrupt our climate, the more we risk severe, pervasive and irreversible impacts

➜ We have the means to limit climate change and build a more prosperous, sustainable future

AR5 WGI SPM, AR5 WGII SPM, AR5 WGIII SPM

IPCC AR5 Synthesis Report

Warming of the climate system is unequivocal

AR5 SYR SPM.1

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IPCC AR5 Synthesis Report

Oceans absorb most of the heat

➜ More than 90% of the energy accumulating in the climate system between 1971 and 2010 has accumulated in the ocean

➜ Land temperatures remain at historic highs while ocean temperatures continue to climb AR5 SYR

IPCC AR5 Synthesis Report

Oceanic uptake of CO2 has resulted in acidification of the ocean

The pH of ocean surface water has decreased by 0.1 (high confidence), corresponding to a 26% of increase in acidity, measured as hydrogen ion concentration

AR5 SYR; AR5 WG1 SPM.4b

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IPCC AR5 Synthesis Report

Humans are changing the climate

It is extremely likely that we are the dominant cause of warming since the mid-20th century

AR5 SYR SPM.3

IPCC AR5 Synthesis Report

Humans are changing the climate

It is extremely likely that we are the dominant cause of warming since the mid-20th century

AR5 SYR 1.10

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IPCC AR5 Synthesis Report

GHG emissions growth between 2000 and 2010 has been larger than in the previous three decades

AR5 SYR SPM.2; AR5 WGIII SPM

IPCC AR5 Synthesis Report

Sources of emissions

Energy production remains the primary driver of GHG emissions

35%24% 21% 14% 6.4%

2010 GHG emissions

Energy Sector

Agriculture, forests and

other land uses

Industry Transport

Building Sector

AR5 WGIII SPM

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IPCC AR5 Synthesis Report

Some of the changes in extreme weather and climate events observed since about 1950 have been linked to human influence

AR5 SYR SPM; AR5 WGI SPM

IPCC AR5 Synthesis Report

Impacts are already underway

• Tropics to the poles• On all continents and in the ocean• Affecting rich and poor countries

AR5 SYR SPM; AR5 WGII SPM

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IPCC AR5 Synthesis Report

AR5 SYR SPM.4

IPCC AR5 Synthesis Report

Projected climate changes

Continued emissions of greenhouse gases will cause further warming and changes in the climate system

Global glacier volume will further decrease

Global mean sea level will continue to rise during the 21st century

It is very likely that the Arctic sea ice cover will continue to shrink and thin as global mean surface temperature rises

Oceans will continue to warm during the 21st century

AR5 WGI SPM

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IPCC AR5 Synthesis Report

Cumulative emissions of CO2 largely determined global mean surface warming by the late 21st century and beyond

AR5 SYR SPM.3

IPCC AR5 Synthesis Report

Surface temperature & sea level are projected to increase / rise during 21 century

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IPCC AR5 Synthesis Report

Strongest surface warming is projected for tropical and NH subtropical regions; high latitudes and equatorial Pacific are likely to experience increased precipitation 

AR5 SYR SPM.7

IPCC AR5 Synthesis Report

Potential Impacts of Climate Change

Food and water shortages

Increased poverty

Increased displacement of people

Coastal flooding

AR5 WGII SPM

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IPCC AR5 Synthesis Report

AR5 SYR SPM.8

IPCC AR5 Synthesis Report

Climate Change Poses Risk for Food Production

AR5 SYR SPM.9

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IPCC AR5 Synthesis Report

Climate Change Poses Risk for Food Production

AR5 SYR SPM.9

IPCC AR5 Synthesis Report

Figure SPM.10, A reader’s guide

From climate change risks to GHG

emissions

AR5 SYR SPM.10

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IPCC AR5 Synthesis Report

Limiting Temperature Increase to 2˚C

Measures exist to achieve the substantial emissions reductions required to limit likely warming to 2°C

A combination of adaptation and substantial, sustained reductions in greenhouse gas emissions can limit climate change risks

Implementing reductions in greenhouse gas emissions poses substantial technological, economic, social, and institutional challenges

But delaying mitigation will substantially increase the challenges associated with limiting warming to 2°C

AR5 WGI SPM, AR5 WGII SPM,AR5 WGIII SPM

IPCC AR5 Synthesis Report

Stabilization of atmospheric concentrations requires moving away from the baseline – regardless of the mitigation goal.

Based on Figure 6.7

AR5 WGIII SPM

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IPCC AR5 Synthesis Report

Stabilization of atmospheric concentrations requires moving away from the baseline – regardless of the mitigation goal.

~3°C

Based on Figure 6.7 AR5 WGIII SPM

IPCC AR5 Synthesis Report

The window for action is rapidly closing

65% of our carbon budget compatible with a 2°C goal already used

Amount Used1870-2011:

515GtC

Amount Remaining:

275GtC

Total Carbon Budget:

790GtC

AR5 WGI SPM

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IPCC AR5 Synthesis Report

Mitigation Measures

More efficient use of energy

Greater use of low-carbon and no-carbon energy• Many of these technologies exist today

Improved carbon sinks• Reduced deforestation and improved forest management

and planting of new forests • Bio-energy with carbon capture and storage

Lifestyle and behavioural changesAR5 WGIII SPM

IPCC AR5 Synthesis Report

Ambitious Mitigation Is Affordable

➜ Economic growth reduced by ~ 0.06%

(BAU growth 1.6 - 3%)

➜ This translates into delayed and not forgone growth

➜ Estimated cost does not account for the benefits of reduced climate change

➜ Unmitigated climate change would create increasing risks to economic growth

AR5 WGI SPM, AR5 WGII SPM

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IPCC AR5 Synthesis Report

The Choices We Make Will Create Different Outcomes

With substantial mitigation

Withoutadditionalmitigation

Change in average surface temperature (1986–2005 to 2081–2100)AR5 WGI SPM

IPCC AR5 Synthesis Report

IPCC Fifth Assessment Report

Synthesis Report(http://www.ipcc.ch)