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• There are many aspects both in climate and in LSL projections where incorrect descriptions of processes, over-simplifications, or even program errors may impact our projections. A particular case is the computation of the fingerprints of ice sheet melting in sea level, where large differences between different groups are found. These differences are most likely due to incorrect description of processes or errors in programs.
• Chaos comes into the picture mainly through the climate system, which includes the atmospheric forcing, the ocean circulation, thermal expansion, and the melting of land-based ice. Chaos does not come in in the computation of the LSL fingerprint of ice sheet melting, which is a rather deterministic and to the largest extent linear problem.
• There is certainly a lack of predictability with respect to the ice sheet response to global warming, and this introduces a large uncertainty into LSL projections.