It once again becomes clear that enhanced energy efficiency improvement remains
the main option for emission reduction in the manufacturing industry. There
are substantial differences in the level of energy efficiency between countries
and also potentials differ. For most OECD countries and for a number of developing
countries extended inventories of emission reduction options in industry exist.
However, the focus is still very much on the heavy industrial sector. The total
potential of energy efficiency improvement for the year 2010 can be estimated
to be 300500MtC for the year 2010. It seems possible to develop new technologies
to sustain energy efficiency improvement in the longer term; if such innovations
materialize the potential can be 700 - 900MtC for the year 2020. The larger
part of these emission reductions can be attained at net negative costs.
A category of options to which only limited attention was paid in relation
to greenhouse gas emission reduction is material efficiency improvement. It
is clear that substantial technical potentials exist. These may be sufficient
to attain emission reductions on the order of 600MtC in the year 2020 (UN, 1997).
However, a significant effort is needed in selection, development, and implementation
of such options. For the shorter term the potential will be substantially smaller
(e.g., 200MtC), because of the complexity of introducing these options.
For virtually all sources of non-CO2 greenhouse gases in the manufacturing
industry, options are available that can reduce emissions substantially, in
some sectors to near zero. However, the total contribution to the emission reduction
is limited: approximately 100MtCeq emission reduction is possible at a cost
less than US$30/tCeq.