I think there are some ideas here that are low risk and low cost. I only know a little about the topic, but it seems doable and much better than the alternative of doing nothing and just taking our medicine.
A very interesting discussion on freezing the poles using aerosols (e.g. sulfur compounds): https://youtu.be/DQbwSI_MI7I
That is far cheaper than dealing with just the effects of rising sea levels, nevermind everything else. It's relatively low risk because the effects don't last long, and they stay trapped by the polar vortex, and nobody lives there. If it doesn't work, or has sufficient undesirable effects, you cancel the experiment.
A very interesting discussion on freezing the poles using aerosols (e.g. sulfur compounds): https://youtu.be/DQbwSI_MI7I
That is far cheaper than dealing with just the effects of rising sea levels, nevermind everything else. It's relatively low risk because the effects don't last long, and they stay trapped by the polar vortex, and nobody lives there. If it doesn't work, or has sufficient undesirable effects, you cancel the experiment.