ABSTRACT
In the 18th century, coal was the main source of fossil fuels; however, oil recovery started in the latter half of the 19th century. And in the 20th century, the world was changed dramatically by oil. The raw materials from oil facilitated mass production of industrial products, and the fuel from oil made mass transportation of people and supplies possible. Though nuclear energy has increased since the 1970s, it is not mainstream because of the well-known radioactive waste problem. The main energy sources in the 21st century are coal and oil. The three fossil fuels—coal, oil, and natural gas—make up nearly 90% of the world’s energy sources. In India, the production of the car Tata-Nano, which is widely talked about because of its low price of 250,000 yen, has already begun. If the Indian middle class starts owning cars like the Americans and Japanese do, oil consumption will certainly jump higher.
