The rapid growth of China and India means that a lot more oil will have to come from somewhere. World demand has grown faster in the past five years than in the second half of the 1990s. Today we consume an average of 85 million barrels daily and that figure will rise to 113 million barrels by 2030. A survey of the four countries with the biggest reported reserves – Saudi Arabia, Iran, Iraq and Kuwait – reveals major concerns. Iran became the first major oil producer to introduce oil rationing. A report on Saudi Arabia’s oil reserves showed that the figure went from 79 barrels a day in 2002 to 84.5 million in 2004. There are still 909 billion tons of coal worldwide, enough to last at least 155 years. But coal is a dirty energy resource. The natural gas fields should last 20 years longer than the world’s oil reserves and is expensive to extract and transport. Hydrogen fuel cells can provide us with an energy source but there is not enough hydrogen to go round and the few clean ways of producing it are expensive. Oil – dependent nations are turning to renewable energy source. An increase in the using of oil all over the globe will increase the chance of a disaster and the risk of dangerous substances getting into the atmosphere.