It depends on why the sea levels are rising.
Are they rising because of heavy Planet Buster use? If so, nothing is going to help that cause.
Are they rising because of heavy terraforming, especially excessive boreholes and mineral output? If so, then if you are the one doing all that activity, simply stop doing so, or build tree farms and hybrid forests in all your bases. If other factions are doing the polluting, then you can go to war with them and either take over the highest polluting bases, or destroy their boreholes (by bombing) and Nessus Mining stations (by using your orbital attack).
However, if you don't have the position in council to effect the Solar Shade vote then any other mechanism will probably not be available to you either.
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