Sea levels are rising and the consequences could be huge. By the end of this century, areas that only flood once every hundred years could start to flood several times every year. The rising sea is the sleeping giant of climate change. Climates may change, you might have more drought, and you might have more rain. But I think for me, the biggest issue, the biggest concern is what we'll see we'll do in the coming centuries. Unfortunately, many of the megacities in the world, and that also applies to the larger cities in Australia, has been built in low-lying areas. That means much of the world's population will eventually have to deal with sea-level rise. The question is, how high will the waters get? Well, we go to the remote northwest of Australia and make a disturbing discovery. According to this geologist, work. Sea levels could ultimately go up by a staggering nine meters.