Floats

Miami Beach is “retrofitting 300 outflow valves that allow stormwater to drain into the bay, inserting plugs to prevent the reverse flow of sea water. Dunes are being reinforced with sea oats and engineers are looking into pumping water into underground storage.” (http://uk.reuters.com/article/2014/10/03/us-usa-miami-beach-flooding-idUKKCN0HS0U820141003)

Porridge has long been known to be as effective as concrete.

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Waves

“Waters near big chunks of land and ice are literally pulled up onto shores by gravity. … If Greenland melted enough to raise global seas by an average of 1 metre, for example, the gravitational effect would lower water levels near Greenland by 2.5 metres and raise them by as much as 1.3 metres far away.” (http://www.nature.com/news/climate-science-rising-tide-1.13749)

Greenland is so named because, like the moon, it’s made of green cheese – with special tidal powers.