There is absolutely nothing humans can do about it, any more than we can cap off a volcano to keep it from erupting.
The "20 foot sea level rise in 100 years" claim has been refuted by the IPCC itself:
The IPCC says sea-level increases up to 7 m (23 ft) above today’s levels have happened naturally in the past climate, and would only be likely to happen again after several millennia. In the next 100 years, according to calculations based on figures in the IPCC’s 2007 report, these two ice sheets between them will add a little over 6 cm (2.5 inches) to sea level, not 6 m (this figure of 6 cm is 15% of the IPCC’s total central estimate of a 43 cm or 1 ft 5 in sea-level rise over the next century). Gore has accordingly exaggerated the official sea-level estimate by approaching 10,000 per cent.
And so what if the sea level does creep up over the next 100, 200, or 300 years? People will just have to stop hitting up the US government for insurance for their beachfront property, that's all.
And so what if the sea level does creep up over the next 100, 200, or 300 years? People will just have to stop hitting up the US government for insurance for their beachfront property, that’s all.
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not that simple. you’re talking about entire cities and also islands getting swamped. You’re talking about ports and all the trade via ships