Table SPM-4. (WGIII) Estimated global macro-economic costs in 2030a for least-cost trajectories towards different long-term stabilization levels.b,c
| Stabilization levels |
Median GDP reductiond |
Range of GDP reductiond,e |
Reduction of average annual GDP growth ratesd,f |
| (ppm CO2-eq) |
(%) |
(%) |
(percentage points) |
a) For a given stabilization level, GDP reduction would increase over time in most models after 2030. Longterm
costs also become more uncertain. [Figure 3.25]
b) Results based on studies using various baselines.
c) Studies vary in terms of the point in time stabilization is achieved; generally this is in 2100 or later.
d) This is global GDP based market exchange rates.
e) The median and the 10th and 90th percentile range of the analyzed data are given.
f) The calculation of the reduction of the annual growth rate is based on the average reduction during the
period till 2030 that would result in the indicated GDP decrease in 2030.
g) The number of studies that report GDP results is relatively small and they generally use low baselines.
|
| 590-710 |
0.2 |
-0.6 – 1.2 |
< 0.06 |
| 535-590 |
0.6 |
0.2 – 2.5 |
< 0.1 |
| 445-535g |
not available |
< 3 |
< 0.12 |
Source: IPCC Climate Change 2007:  "Mitigation, Summary for Policymakers", p12
|
