What you refer to “Minor signs”, is just like any of the so called “Fortune tellers' predictions". There are events that anyone can predicts, the like of ”History repeat itself”.
As an Economist I have ... Predicted fairly accurately events that due to various reasons would happen. Like the Australian dollars fluctuation, in most instances is being control by the movement of the interest rates movement of the Reserve Bank, many clients of mine did make a lot of money from my ... predictions.
I can assure you that having knowledge of the future a time can be a very bad thing, I personally try to follow the Quran, because of that, I know that one day I will die and I am also certain of an life after, I know that if I do something wrong I will suffer in this life and in the life after.
Any one can predict:
The end of this world,
The end of any person life,
Increase in the consumption of drugs (more leisure time and reduced quality time with family)
World famine will increase
Crime rate will continue to increase
Alternative source of energy will be found
and the list could go on without being a fortune teller.
There is no doubt that all fortune tellers, or charlatans.
My regards to you,