Sea level rise has big effects

Probability: 90%

Timeline: 25 years

This one seems to be a no-brainer. Just quickly reading the Wikipedia entry about sea level rise show this to be very likely.

The real questions to consider at this point are:

1. How fast will it happen?
2. What areas will be impacted the most?

Certainly low-lying island nations are most at risk. In fact, large parts of Tuvalu have already been evacuated and the entire country may eventually have to be abandoned!

How well can coastal populations deal with a 1-meter rise in sea levels by the end of the century? We'll have to see.

War rages on

Probability: 90%

Timeline: Forever

If there has been one constant since the beginning of civilization, it is war.

In good times and bad, people always seem to manage to find things to fight about.

We kill each other for beliefs, revenge, food, water, oil, diamonds -- you name it.

I believe the number one threat to human existence has been and will continue to be -- human existence.