Twenty years ago I decided, for reasons imaginative and nerdy, to create an accurate map of what Cape Town’s coast would look like if the sea level rose by (an admittedly extreme) 5m.

My friend Thomas, then an environmental and geographical sciences undergrad, introduced me to an academic who kindly explained the alarming basics of sea-level rise. The gist: if the water is coming up by one unit, it’s usually coming inland by a lot more.

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