Table
SPM.1
Estimates of potential global greenhouse gas emission reductions
in 2010 and in 2020
(Sections 3.3>3.8
and Chapter
3Appendix)
Source
& © :
|
| Sector |
|
Historic emissions
in
1990
|
Historic
Ceq annual growth rate in 1990-1995
|
Potential
emission reductions
in 2010
|
Potential
emission reductions
in 2020
|
Net direct costs per tonne of carbon avoided
|
| |
|
(MtCeq/yr)
|
(%)
|
(MtCeq/yr)
|
(MtCeq/yr)
|
|
Buildingsa
|
CO2
only |
1,650
|
1.0
|
700-750
|
1,000-1,100
|
Most reductions are available at negative net direct
costs. |
Transport
|
CO2
only |
1,080
|
2.4
|
100-300
|
300-700
|
Most studies indicate net direct costs less than US$25/tC
but two suggest net direct costs will exceed US$50/tC. |
Industry
|
CO2
only |
2,300
|
0.4
|
|
|
|
| -energy efficiency |
|
|
|
300-500
|
700-900
|
More than half available at net negative
direct costs. |
| -material efficiency |
|
|
|
~200
|
~600
|
Costs are uncertain. |
Industry
|
Non-
CO2
gases |
170
|
|
~100
|
~100
|
N2O emissions reduction
costs are US$0-US$10/tCeq. |
Agricultureb
|
CO2
only |
210
|
|
|
|
Most reductions will cost between US$0-100/tCeq
with limited opportunities for negative net direct cost options. |
| |
Non-
CO2
gases |
1,250-2,800
|
n.a
|
150-300
|
350-750
|
| Wasteb
|
CH4
only |
240
|
1.0
|
~200
|
~200
|
About 75% of the savings as methane recovery from landfills
at net negative direct cost; 25% at a cost of US$20/tCeq.
|
| Montreal Protocol |
Non-CO2
gases |
0
|
n.a.
|
~100
|
n.a
|
About half of reductions due to difference in study
replacement applications baseline and SRES baseline values. Remaining
half of the reductions available at net direct costs below US$200/tCeq.
|
Energy supply
and conversionc |
CO2 only |
(1,620)
|
1.5
|
50-150
|
350-700
|
Limited net negative direct cost options exist; many
options are available for less than US$100/tCeq. |
| Total |
|
|
|
|
|
|
