what do you think will happen if there will be no more oils extracted underground?

Answer 1

Everything would come to a halt. Most technology would not work, most transportation would not work, most communication would not work. Hundreds of thousands of people would starve to death, because very few people are self reliant. In the end, the first world would collapse while sections of the third world would survive.

Answer 2

Our lives will be lived in the cold and dark, except for those living in tropical and subtropical climates. They will live in sweltering heat and humidity and the dark.

Answer 3

U will starve with many others.