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The Economics of Climate Change: Reflections on the Stern Report - - PowerPoint PPT Presentation
The Economics of Climate Change: Reflections on the Stern Report - - PowerPoint PPT Presentation
The Economics of Climate Change: Reflections on the Stern Report Dennis Anderson Imperial College Centre for Energy Policy and Technology (ICEPT) February 2007 Origins 1. Ministries of Finance Increasingly Engaged: a) Intervening in newly
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Scope (1)
1. Approach: assumptions of ‘traditional’ cost-benefit analysis questioned:
- ethical precepts;
- limits of marginal analysis;
- uncertainties and risks;
- long-term nature of problem
2. Economic Impacts of Climate Change 3. Economics of Stabilization—benefits and costs 4. Policies for Mitigation 5. Policies for Adaptation 6. International collective action
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Scope (2)
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Benefits of Mitigation: (1) Temperature Rises
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Benefits of Mitigation: (2) Human and Physical Impact
- Falling crop yields in Africa
- Loss of glaciers and melt-water for irrigation in Asia
- Increased rates of run-off and flooding
- Extreme weather events
- Loss of Greenland Ice-cap
- Loss of Gulf Stream
- Intensification of greenhouse effect through thawing of permafrost
- ………
……thought possible for some time ( ~ 2% probability in 2000) ……now thought likely—such scenarios are no longer ‘alarmist’ (recent estimate is > 50% probability at 3 ˚C)
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Benefits of Mitigation: (3) Raw Economic Effects
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Mitigation: estimating the costs
1. Estimate two emission trajectories
- Without policies in place (BAU)
- Trajectory to stabilise accumulations at 450—550 ppm
2. Compare costs of alternatives with fossil fuels 3. Examine alternative portfolios, bearing in mind constraints and energy system requirements 4. Allow for changes in income elasticities of demand 5. Calculate costs per ton of abatement 6. Add up the costs statistically (all the above are uncertain)
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Costs of Mitigation: (1) Emission Trajectories
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(2) Incremental Costs of Low Carbon Options as % Costs of Fossil Fuels
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(3) Portfolios considered. An example.
- Above include hydrogen production for transport and dCHP
- 20,000 ‘trials’ Using Monte Carlo Analysis
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(4) Changes in Income Elasticity (energy efficiency)
Per Capita Income Elasticity of Energy Demand vs Per Capita Income
- 0.5
0.5 1 1.5 2000 4000 6000 8000 10000 Per capita income (ppp, 1985 US$) E l a s t i c i t y Is it moving downwards? Source: Plotted from Judson, Schmalensee and Stoker (1999).
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(5) Costs per ton of CO2 Abated
High oil and gas prices; higher rate of innovation Low oil and gas prices; lower rate of innovation
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(6) Costs as % of World Product
World product should grow by ~ 200% by 2050:
- 125% in the OECD economies
- 350% in the developing economies
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Climate Change Mitigation Policies
1. Carbon pricing—carbon taxes or tradable permits 2. Double R&D effort, which declined by 50% since 1974 3. 3-5 fold increase in finance for innovation over the next 10 years, from $35 billion/year today. Instruments:
- Feed-in tariffs
- Renewables obligations (transport and power)
- Tax incentives, grants and credits …..
4. Address ‘barriers’ to uptake of efficiency 5. Take up ‘win-win’ opportunities---remove fossil fuel subsidies; congestion pricing… 6. Above as basis for international co-operation, supported by CDM and Clean Energy Investment Facility of World Bank
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The Decline of the R&D Effort in the OECD 1974-present
- 5,000
10,000 15,000 20,000 25,000 1974 1979 1984 1989 1994 1999 2004 OECD: Million USD, 2004 prices and exchange rates
Other Power & Storage technologies Nuclear Fusion Nuclear Fission Renewable Energy Fossil Fuels Conservation
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