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Using data from the Netherlands Environmental Assessment Agency and the International Energy Agency, Dan Walker and Sarah Brett explained how the world's use of energy has risen by a factor of almost one thousand since 1800. In just over two centuries, the population of the world has risen from around one billion people to somewhere around seven billion. In the same period industrialisation, the rise in transport and consumer technology and access to new energy sources has pushed consumption from the equivalent of just over 9 million tonnes of oil each year, to around 9 billion tonnes.