The Economics of Climate Change in the Pacific. Asian Development Bank 26 November 2013 Sydney, Australia

Transcription

1 The Economics of Climate Change in the Pacific Asian Development Bank 26 November 2013 Sydney, Australia

2 Key Questions How serious is the potential effect of climate change for the Pacific? What are the impacts of climate change on key economic sectors? How costly is climate change to the Pacific? How can countries adapt to a highly uncertain climate change? How much investment is needed for adaptation to climate change?

3 Background on the Pacific - Geography

4 Pacific Vulnerability Regional Growth in Real GDP Per Capita, Share of Pacific Economies Dependent on Natural Resources (GDP Share by Sector, %) Economic Cook Fiji Kiribati Marshall FSM Palau PNG Samoa Timor Tonga Vanuatu Indicators Islands Islands Leste Agriculture Industry Services of which internation al tourism receipt Tourism plus agriculture Employment in agriculture

5 Study Approach Objective to identify and indicatively quantify key potential impacts of climate change in the Pacific through components Climate modeling Sector impact assessment Sea level rise, water availability and storm risk Agriculture, marine/fisheries tourism and health Integrated assessment modeling FUND09 PAGE 3.6

6 Methodology Modeling Framework Impact Assessment SRES A2, A1B, GCM RCM Sectoral physical impact modeling and assessment ( 5 sectors ) Change in temperature, sea level, precipitation, extreme events Country stocktaking SRES Scenarios SRES A2, A1B, B1, B2 Integrated assessment modeling (PAGE 09) Integrated assessment modeling (FUND3.6) Economic Implications Costs of climate change Economics of adaptation Funding/investment requirements Economic Assessment

7 Climate scenarios modeled High emissions scenario (business as usual, fossil fuel-intensive growth) Medium emissions scenario High emissions scenario (resulting from slow economic growth and technological progress)

8 Average temperature differences vs (mean of GCMs under A1B (Medium Emissions) Scenario) Fiji Vanuatu Papua New Guinea Samoa Solomon Islands Timor-Leste

9 Rainfall RegCM3 downscaling, mean of 16 GCMS, A1B (Medium Emissions) Scenario Country Baseline Rainfall (mm) Projected Change in 2050 (%) Projected Change in 2070 (%) Papua New Guinea Annual Peak Month (Dec) Driest Month (Sep) Solomon Island Annual Peak Month (Mar) Driest Month (Jun) Vanuatu Annual Peak Month (Mar) Driest Month (Sep) Fiji Annual Peak Month (Mar) Driest Month Samoa Annual Peak Month (Jan) Driest Month

10 Projected sea level rise (A1B (Medium Emissions) Scenario, 7 GCMs) Extrapola tion of historical Aviso data Sea level rise (m) relative to Extrapola tion of historical GCM GCM Aviso GCM Low High data Low GCM High Fiji Islands Papua New Guinea Samoa Solomon Islands Timor-Leste Vanuatu Area (km 2 ) % of land area Mean of GCMs

11 Crop growth modeling GIS data on distribution of cropped area Soil data from global database Data on varieties and management Climate projections from downscaling model Crop distribution maps Agricultural production situations Technology interventions Climate change Impact analysis using DSSAT Assessment of potential adaptation options

12 Agricultural modeling results commissioned for this study (A1B (Medium Emissions) Scenario, ECHAM5 GCM, RegCM3 downscaling, no CO2 fertilization) Crop Type Country Worst case Best case Worst case Best case Sugarcane Fiji Samoa Sweet potato PNG Solomon Maize Timor Leste Vanuatu n.d. n.d.

13 Parallel agricultural modeling results by Rosegrant et al. (2013; A1B (Medium Emissions) Scenario, 5 GCMs, CO2 fertilization included) Yield effects from climate change 2050, compared with 2000 (%) Papua New Guinea Solomon Islands Fiji Crop Worst Case Best Case Worst Case Best Case Worst Case Best Case Cassava, rainfed Maize, irrigated Maize, rainfed Rice, irrigated Rice, rainfed Sugarcane, rainfed Sweet potatoes, rainfed Taro, rainfed

14 Actual cover as a percentage of maximum cover Marine/fisheries Thermal stress from increased ocean temperatures leads to coral bleaching Estimated via FUND Ocean acidification as a result of increased CO2 absorption Distribution of open ocean fisheries catches moves eastwards Projection of Coral Cover under Climate Change FUND A1B (Medium Emissions) Scenario

15 Impact on total tourism revenue Tourism Changes in tourism arrivals as a result of a less attractive climate Declines in all countries relative to baseline Will be exacerbated by coral bleaching The impact of climate change on total tourism revenue in 13 Pacific island nations for the A1B (medium emissions) scenario 0% -5% -10% -15% -20% -25% -30% Fiji Papua New Guinea Samoa Solomon Islands East Timor Vanuatu Kiribati Marshall Islands Micronesia, Fed States Nauru Palau Tonga Tuvalu -35% -40%

16 Health Increased vector borne disease transmission Heat stress from increased heat and humidity, resulting in reparatory/ cardiovascular disease Increased food borne disease Health effects for 14 Pacific island nations under the A2 (high emissions) scenario, FUND 3.6

17 Integrated assessment modeling Integrated climate-economic models FUND 3.6 Includes agriculture, forestry, sea-level rise, health, energy consumption, water resources, unmanaged ecosystems, and storms Modeled as power functions or movement relative to optimum climatic conditions, in the context of exogenous changes affecting vulnerability PAGE09 Probabilistic model (Monte Carlo simulation) 8 world regions and ten time periods to the year 2100 Four impact sectors (sea level, economic, non-economic, and discontinuities)

18 Climate Change Cost in the Pacific by Scenario using FUND B1, FUND A1B, FUND A2, FUND A1B, PAGE A1B = medium emissions scenario, A2 = high emissions scenario, B1 = low emissions scenario.

19 Climate Change Cost in the Pacific by Scenario using PAGE ppm, PAGE A1B, PAGE A1FI, PAGE A1B, FUND A1B = medium emissions scenario, A1FI = high emissions scenario.

20 Overall economic effects by sector (FUND A2 (High Emissions) Scenario)

21 Economic effects by country (FUND A2 (High Emissions) Scenario, % GDP loss, annual)

22 Sectoral impacts by country (FUND A2 (High Emissions) Scenario, % GDP, annual) % of GDP Fiji Islands % of GDP Samoa % of GDP Papua New Guinea % of GDP Solomon Islands 2030 % of GDP Timor Leste Tropical % of GDP Vanuatu storm Biodiversity Cooling Forestry Water resources Mortality Morbidity Dryland Wetland Coastal protection Migration Agriculture

23 Probabilistic Annual Cost of Climate Change in the Pacific (PAGE09, A1FI (high emissions) scenario)

24 Annual average adaptation cost during for Pacific, PAGE09 a. Adaptation target aimed at the impact by 2100 Scenario Adaptation target Annual average cost Range US$ million Annual average cost % GDP Range % GDP A1FI(a) 2100 worse case ( 95th percentile)* A1FI(b) 2100 (4.5 o C, 0.70 m SLR) A1B 2100 (4.0 o C, 0.65 m SLR) ppm 2100 (2.5 o C, 0.55 m SLR) Note: The 95th percentile represents the critical point. Moving beyond, there is a low probability ( at 5% chance) that would lead to a catastrophic outcome b. Adaptation target aimed at the impact by 2050 Scenario Adaptation target Annual average cost Range US$ million Annual average cost % GDP Range % GDP A1FI 2050 (2.5 o C, 0.30 m SLR) A1B 2050 (2.0 o C, 0.30 m SLR) ppm 2050 (1.9 o C, 0.30 m SLR) A1B = medium emissions scenario, A1FI = high emissions scenario.

25 Key messages Average temperatures in the Pacific are expected to rise by o C above the 1990 level in Sea level rise poses a risk of inundation and freshwater salinization Effects of climate change on key economic sectors (agriculture, fisheries and tourism) are negative and potentially large Health effects will compound other sectoral impacts Climate change will cost the Pacific % of GDP annually by 2050; further losses are expected by Adaptation funding needs are substantial

26 Policy implications Mainstreaming climate change actions in development planning is crucial to avoid large climate impacts Low regret adaptation measures are essential E.g. Stress tolerant varieties, interventions to reduce disease transmission Risk-based approaches can help prioritize adaptation needs Climate proofing of infrastructure can help improve longterm sustainability Improved access to climate finance is needed to support adaption Successful adaptation efforts require strong cooperation and coordination within and beyond the region

27 Thank you. FOR INFORMATION, CONTACT: Robert Guild Director, Transport, Energy and Natural Resources Division Pacific Department, ADB Cyn-Young Park Assistant Chief Economist, Economics and Research Department, ADB OR VISIT