Greenhouse Economics and the Costs of Global Warming
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GREENHOUSE ECONOMICS AND THE COSTS OF GLOBAL WARMING Samuel Fankhauser A thesis submitted for the degree of Doctor of Philosophy University of London Department of Economics University College London January 1994 ProQuest Number: 10045522 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest 10045522 Published by ProQuest LLC(2016). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 Für meine Eltem ABSTRACT My thesis deals with the economics of global warming. It focuses mainly, but not exclusively, on an aspect which has perhaps gained less attention in the literature so far, the economic costs of "greenhouse damage". The thesis is structured into five parts. Part I reviews the existing literature on greenhouse economics, including a first overview of work dealing with the economic costs of global warming. Part II then assesses the costs of global warming associated with a doubling of atmospheric CO 2 concentration, the benchmark typically used by scientists to assess the physical impacts of climate change. Part III provides estimates of the marginal damage per tonne of emission for several greenhouse gases, figures which are of importance for the assessment of individual abatement projects. The calculations are based on a stochastic greenhouse damage model in which all key parameters are random. It therefore also allows insights into the likelihood of different damage cost scenarios. Part IV picks out one particular aspect of greenhouse damage - sea level rise - and studies it in more detail. Sea level rise is a good example of the fact that a part of greenhouse costs are not damage costs as such, but arise from the implementation of damage mitigation strategies, such as the erection of sea walls. In addition to providing a more detailed assessment of the economic costs of sea level rise. Part IV also analyses the relative role of protection and mitigation expenditures within the total costs of sea level rise. Part V (written jointly with Snorre Kvemdokk of Statistics Norway) finally offers an illustration of how the costs and benefits of abatement ought to be put together to determine the socially optimal result. It introduces a stylised model of greenhouse gas negotiations, in which countries negotiate to reach a socially optimal greenhouse treaty. TABLE OF CONTENTS List of Figures 6 List of Tables 7 Acknowledgements 9 Preface 10 PART I: ECONOMICS AND GLOBAL WARMING 12 1. The Emergence of the Greenhouse Problem 13 2. Energy Models and the Costs of Greenhouse Gas Abatement 16 2.1 The Different Modelling Approaches 16 2.2 Model Comparisons 19 2.3 Assessment and Extensions 22 3. The Economic Costs of Global Warming Damage 25 3.1 Agricultural Damage 26 3.2 Sea Level Rise 28 3.3 Enumerative Approaches 29 3.4 Extensions and Critique 32 4. The Optimal Policy Response to Global Warming 36 4.1 The Cost Benefit Approach 36 4.2 Discounting 40 4.3 Hedging and Uncertainty 45 4.4 The Carbon Budget Approach 49 5. Policy Instruments and Carbon Taxes 50 5.1 Choosing the Instrument 51 5.2 Distributional Issues 53 5.3 Revenue Recycling and Double Dividend 55 6. International Cooperation 57 6.1 Sharing the Abatement Burden 57 6.2 Unilateral Action 61 7. Conclusions 64 PART H: THE ECONOMIC COSTS OF CO^ CONCENTRATION DOUBLING 67 1. Introduction 67 2. Individual Damage Categories 69 2.1 Sea Level Rise Protection Costs 69 2.2 Dryland Loss 72 2.3 Coastal Wetland Loss 74 2.4 Species and Ecosystems Loss 77 2.5 Agriculture 79 2.6 Forestry 81 2.7 Fisheries 84 2.8 Energy 84 2.9 Water 87 2.10 Other Sectors 90 2.11 Human Amenity 91 2.12 Morbidity and Mortality 93 2.13 Air Pollution 97 2.14 Migration 100 2.15 Natural Disasters 102 3. Total Damage 106 4. Concluding Remarks 109 Appendix: Basic Economic Indicators Used 111 PART m : THE SOCIAL COSTS OF GREENHOUSE GAS EMISSIONS 112 1. Introduction 112 2. Existing Damage Estimates 115 3. A Stochastic Greenhouse Damage Model 118 3.1 General Description 118 3.2 Future Emissions 120 3.3 Atmospheric Concentration 122 3.4 Radiative Forcing 123 3.5 Temperature Rise 124 3.6 Annual Damage 125 3.7 Discounting 128 4. The Social Costs of Greenhouse Gas Emissions 131 4.1 The Social Costs of CO 2 131 4.2 Other Greenhouse Gases 135 4.3 Sensitivity Analysis I: Discounting 137 4.4 Sensitivity Analysis II: Greenhouse Angst 139 5. Policy Implications and Conclusions 141 Appendix: Overview on Parameters and Parameter Values 143 PART IV: PROTECTION VS. RETREAT: THE COSTS OF SEA LEVEL RISE 147 1. Introduction 147 2. Greenhouse Gas Abatement vs. Damage Mitigation: The General Context 149 3. A Model of Optimal Sea Level Rise Mitigation 153 3.1 General Description 153 3.2 Protection Costs 155 3.3 Dryland Loss 156 3.4 Wetland Loss 159 3.5 The Sea Level Rise Protection Problem 160 4. Solving the Model 162 4.1 The Optimal Height of Protection Measures 162 4.2 The Optimal Length of Coastal Protection 163 4.3 Costs as a Function of Sea Level Rise 166 5. Simulation Results for OECD Countries 168 5.1 Estimation of Parameters 168 5.2 The Optimal Level of Protection 170 5.3 The Costs of Sea Level Rise 174 6. Summary and Conclusions 178 Appendix 1: Model Parameters 181 Appendix 2; Optimal Degree of Coastal Protection 186 Appendix 3: The Costs of Protection 190 PART V; THE GLOBAL WARMING GAME: SIMULATIONS OF A CO 2 REDUCTION AGREEMENT" 193 1. Introduction 193 2. The Model 195 2.1 General Description 195 2.2 The Climate Module 200 2.3 The Income Function 202 2.4 The Damage Function 205 2.5 Discounting 207 3. Simulation Results 208 3.1 The Non-Cooperative Equilibrium 208 3.2 The Social Optimum 210 3.3 The Gains from Cooperation 212 3.4 Sensitivity of the Results 214 4. Concluding Remarks 216 Bibliography 217 * Jointly with Snorre Kvemdokk (Statistics Norway) LIST OF FIGURES PART I Figure 1: Damage Distribution, Extreme Events and Best Guess Estimates 34 PART n Figure 1 Overview on Global Warming Impacts 69 Figure 2 Global Warming, Energy Demand and Welfare 92 Figure 3 Occurrence of Tropical Cyclones 103 PART m Figure 1 Present Methodology vs. Optimal Control 114 Figure 2 The Probability Distribution of CO 2 Damage 133 Figure 3 CO2 Damage Distribution and the Threat of Catastrophe 140 PART IV Figure 1: SLR and the Loss of Unprotected Land 157 Figure 2: Land Value Distribution and the Value of Protected and Unprotected Land 158 Figure 3: Optimal Coastal Protection in the OECD 172 Figure 4: Optimal Protection in OECD Countries against a 1 Metre SLR 173 Figure 5: The Costs of Sea Level Rise in the OECD 175 Figure 6: The Costs of Sea Level Rise in Individual OECD Countries 176 Figure 7: The Costs of a 1 Metre SLR - The Impact of Discounting 177 LIST OF TABLES PART I Table 1 : GDP Loss due to Emissions Stabilisation at 1990 Levels 20 Table 2: Carbon Tax Necessary for Emissions Stabilisation at 1990 Levels 20 Table 3: Economic Damages from 2x002 31 Table 4: Costs of a US Carbon Tax under Different Recycling Scenarios 56 Table 5: Efficiency Gains from Emissions Trading 58 PART n Table 1 : Costs of Preventing Capital Loss 71 Table 2: Costs of Dryland Loss 73 Table 3: Coastal Wetland Loss 75 Table 4: Benefits from Coastal Wetlands 76 Table 5: Value of Lost Ecosystems 79 Table 6: Costs to Agriculture 80 Table 7: Damage to the Forestry Sector 83 Table 8: Reduction in Fish Harvests 85 Table 9: Costs of Increased Energy Demand 86 Table 10: Damage to the Water Sector 89 Table 11: Damage from Increased Mortality 96 Table 12: Damage through Increased Air Pollution 99 Table 13: Migration Costs 101 Table 14: Costs from Increased Tropical Storms 105 Table 15: Total Damage due to 2xC02 107 Table 16: US Damage Compared to Cline and Nordhaus 108 Appendix: Basic Economic Indicators Used 111 PART m Table 1 : Existing Estimates of CO 2 Emissions Costs 117 Table 2: The Social Costs of Greenhouse Gas Emissions 132 7 Table 3: The Social Costs of CO 2 Emissions - The Impact of Discounting 138 Appendix: Overview on Parameters and Parameter Values 143 PART IV Appendix 1 : Model Parameters 181 Appendix 2: Optimal Degree of Coastal Protection 186 Appendix 3: The Costs of Protection 190 PART V Table 1 Climate Parameters 203 Table 2 The Parameters of the Income Function 205 Table 3 Damage from a Hypothetical 2.5 “C Temperature Rise 207 Table 4 Non-Cooperative Nash Equilibrium 209 Table 5 The Rio Stabilisation Target 209 Table 6 The Social Optimum 209 Table 7 Welfare Gains from Cooperation 213 Table 8 Results for Income Parameter b Based on GREEN 214 Table 9 Sensitivity to Climate Parameters 215 ACKNOWLEDGEMENTS During the course of my studies I have profited from the help of many people and institutions. For one year my work was financed by a stipend of the Schweizerischer Nationalfonds für Forschung und Wissenschaft, and their support is gratefully acknowledged.