Geoscience Reference
In-Depth Information
6
Total undiscounted
Undiscounted damages
Abatement costs
5
4
3
2
1
0
0
1
2
3
4
5
6
Global temperature limit (°C)
Figure 29.
Total costs of different temperature targets assuming 100 percent effi ciency
and no discounting. This fi gure shows the undiscounted annual costs of emissions
reductions (the downward-sloping line), damages (upward-sloping line), and total
costs (U-shaped curve) for each temperature limit. All values are undiscounted. This
takes the idealized case of effi cient abatement and universal participation. The damage
curve here assumes that there are no catastrophic damages or tipping points.
that implementation is perfectly effi cient and that there is 100 percent
participation, so the abatement costs are at the bare minimum.
The total undiscounted cost curve is U-shaped because it is costly at
the two extremes of very low and very high temperature limits. At the
upper temperature changes, the high costs are due to extreme damages
