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         Fig. 2.9 Growth of ZEE to 2100 assuming rapid transition away from FF, and TFC growth in
         line with historical trend.

         achieved provided the infrastructure is laid down in the next couple of decades to
         deliver ZEE at the necessary global scale in the second half of the century. This would
         be consistent with the two to three generations needed for the global penetration of
         major new technological infrastructure, but requires the alignment within the next
         decade of the political, market, and social forces necessary to make it happen.


         2.8   Conclusion


         Robust policies are those that deliver at least adequate outcomes in the broadest range
         of plausible futures. Robust policies rarely deliver optimal outcomes in what might
         from time to time be considered the most probable futures; this is the price to be paid
         for the system redundancy needed to protect against the undesirable futures currently
         thought less likely, or not even contemplated, yet eminently possible. Climate policy
         that is based on the more, rather than the less challenging plausible futures, will min-
         imize a wider range of risks and will therefore be more robust.
            Greater amounts of greenhouse gas removal allow for a more gradual transition
         from fossil fuel energy to zero emissions energy. Too little greenhouse gas removal
         forces the pace of the transition, possibly beyond the capacity of the global
         energy infrastructure to cope; too much greenhouse gas removal could not only
         have significant cost implications but might also promote complacency among
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