What warning signs are you looking for?

[Nix]

There's always a breaking point where suddenly everything changes. My guess is that there are several areas of our lives that are using up their buffers and reaching breaking point. Finacial markets, weather balance, society's tolerance and just plain stupidity to name just a few.

Add to that any seen or unforseen natural events which would act as a catalyst.

Listen to the news, feel the general atmosphere, ears and eyes open.