Some day gas and crude oil will be a thing of the past. With innovations here and there. In your own opinion what will replace gas and crude oil in the international market.
I doubt gas and crude oil can become irrelevant in the world. The world power are controlling this market in a way they won't want something different to take over. The Saudis will do everything in their power to keep crude at the top of the market and every other thing will just be sharing what's left of the market. Many other fuels and energy has been developed but yet it can't overthrown the market share that crude and gas has and that's because the cartels don't want that to happen. They're benefiting so much from this that they're ready to sabotage any other source of energy that'll contest the their share of the market.