The modern reef is relatively recent (thousands of years) and has been land during human history. There are aboriginal stories that recount when it rapidly floo

The modern reef is relatively recent (thousands of years) and has been land during human history. There are aboriginal stories that recount when it rapidly flooded at the end of the last ice age, which may be more than just legends. This fate could await many of our coastal cities given the thermal expansion of the oceans (let alone if a large land-based ice sheet melts). https://en.wikipedia.org/wiki/Great_Barrier_Reef#Geology_and_geography https://en.wikipedia.org/wiki/Great_Barrier_Reef#Geology_and...