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Modern society is dependent on a reliable, abundant supply of energy. As our populations and cities get bigger, that demand is only set to grow: the U.S. Energy Information Administration (EIA) has predicted that by 2040 global energy consumption will have increased by 56 percent.

Here, CNBC takes a look at the world's biggest producers of crude oil, nuclear and hydro energy, according to the International Energy Agency's (IEA) Key World Energy Statistics for 2014.

By Anmar Frangoul, special to CNBC.com

Ralph Hettler | E+ | Getty Images