What if the world do if there was no more fossil oils to be taken from the earth..?

Answer 1

Eventually that will be the case. We will need to supply more of our electricity from nuclear, hydroelectric, solar, geothermal, and other sources.

Fossil fuel stores a lot of energy. Although people could drive eletric cars, they will not harvest wheat with electric combines. For that you need a potent fuel source.

Also imagine the energy we use for shipping food around the world. The big grain trucks will not run very well on batteries or on solar power. Then there is the energy used for pumping water out of rivers and aquifers to irrigate land.

In the old days farmers used flood irrigation to water their crops. What this means is NOT that they let rivers flood, but that they could divert water through canals and aquaducts so that it flowed across their fields by the force of gravity.

Today we have big sprinkler systems pumping fresh water out of aquifers over land at much higher elevation, because we paved all the rich low lying farmland over with shopping malls and suburbs. The farms of both of my grandfathers are now covered with asphalt and concrete.

It is just one more thing to think about. The world isn't going to come to an end tomorrow. But the population will keep going up, while irreplaceable energy resources and fresh water supplies will decline. Eventually we will be in for a big surprise. At our present level of technology, our planet can sustain a population of about two billion.

We are over six billion now, and we will pass eight billion before the problems begin to set in. Things could get interesting.

Answer 2

Simple economics tells us that this will never happen, so don't worry.