What will happen if petroleum fuel is over?

lol! that will be a nightmare for people who are used to living in modern world. but to those who are used to simple living, its not really that difficult. hehe

Basics? Pulling carts, horses, rickshaws etc Wow!

ya a nightmare exactly. just imagine there will be no flights, oh God how will people travel such long distances? we have to rely on sail ships again... ~cheerio~

Ya the Hydrogen Cell is a promising step. Even scientists are working on to control the nuclear reactions, if they succeed then we can have a suitable and efficient replacement for petroleum products. Lets hope the best. ~cheerio~

Even an efficient way of tapping renewable energy resources would be great . A new kind of Solar panel using enriched lithium is under construction . Scientists claim that it can produce two time the energy of a conventional solar cell . So that too seems a good idea . And if scientists find a easy way to make nuclear fusion in a controlled way , then most of our power crisis would be solved and we can use electricity for everything as fusion releases more energy that the present used technology of fission . There has been and innovation in producing electricity . It is a kind of pad which can be placed in crowded places on the ground . When people step on it , it produces electricity . That too is a promising way to produce electricity in future .

Ya heard of that in a science conference. Many countries are even working on making energy from nuclear resources. Hope it turns out positive. ~cheerio~

Yes indeed. Nuclear power has been available for over 30 years. It's awesome but we should be aware of the risks. The chernobyl disaster proved having the best security possible is absolute key.