As global temperatures warm, not just the atmosphere, but also the hydrosphere (water) and the cryosphere (ice) absorb the extra energy. The cryosphere turns back into the hydrosphere and as a result sea levels rise globally.
Already scientists are considering how best to protect coastlines from rising sea levels that have caused major disaters in recent years, especially when combined with extreme weather events such as Hurricane Katrina that devastated New Orleans. This article contrasts ‘hard’ and ‘soft’ approaches, The former is about building man-made (Machine World) barriers; the latter about desiging with nature (Natural World) bio-ecological solutions that will be self-sustaining. From the perspective of Spaceship Earth design with nature using the sun’s energy and naturally evolved solutions seems clearly preferable.