SODBatch A&B SPM Comments co-chair response final ... - ipcc-wg3

Chapter-
Comment
SPM-
522
SPM-
523
SPM-
524
para
Batch
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Comments
IPCC WGIII Fourth Assessment Report, Second Order Draft
6 A 7 20 7 20 Term 'biomass' is unclear - for categories of mitigation measures in
Fig SPM.4, which of terms 'biofuels' and 'forest sinks' does it relate
to? Caveats need to be added on biomass – is this referring to
biomass co-generation? / with CCS? Needs to be more detailed
discussion of pros and cons of biomass in chapter proper.
(Government of Australia)
6 A 7 20 7 21 “Biomass could contribute substantially to achieving stabilization
targets (for illustrative examples see figure SPM.4).” Following this
statement, it is critical to provide the estimate of how much the
substantial biomass use exacerbate the food security and explain if,
to what extent and how the modeling studies included the food
security in the analysis to arrive at the projections of the bio-fuels
supply.
(Government of India)
6
F
4
A 7 20 0 0 The message of this figure seems questionable; this figure should
be deleted. Other studies indicate much higher contributions of
renewables compared to CCS. Especially, the low fraction of "other
renewables" does not seem plausible given the very high potential
of technologies such as wind, solar, geothermal. Therefore, the
limited set of models leads to a bias towards CCS. It is
recommended to delete this figure as long as it is not embedded in a
critical discussion of the underlying parameters (very pessimistic
for renewables, very optimistic regarding CCS). The high CO2
mitigation potential of fossil CCS is questioned by other authors for
a number of reasons, amongst others time frame of technological
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
Action
for
chapter
Considerations
by the writing
team
We need a bio energy
fuel
(4)
Accepted.
paragraph, see A-1
Biomass will be
replaced by
modern
bioenergy.
(4)
See A-522 Noted.
Regarding
competition
between food
and fuel SPM
claims that this
isn’t an issue at
global level.
Nevertheless it
is critical in
several regions.
This is
discussed
elsewhere.
(4)
See A-455 Accepted. The
figure will be
modified.
(4)
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