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.
Even if crude and oil are eventually replaced by renewable energy sources like solar, wind, or nuclear for power generation, their role goes far beyond just fuel. Lubrication, petrochemicals, plastics, and many fabrication processes depend heavily on crude oil byproducts. So while energy innovation might reduce demand for oil as fuel, replacing it entirely in industrial applications will be much harder.