Two recent shows on the Discovery Channel described some major catastrophes that are quite certain to occur (they say) ... some time in the next 100,000 years.
The first is a collapse of an island into the sea generating a mega tsunami several hundred feet high. One candidate island is located so its tsunami would strike the US Eastern shore. A small scale version of such a huge wave seems to have occurred quite recently in a small bay.
The second is a huge volcano which could lower Earth's temperature drastically. They describe studies that suggest a huge volcano about 80 thousand years ago reduced the human population to a few thousand.
These are very interesting shows, marred only by an overly portentous style of narration and hyper-dramatic music.
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