Examine the graph, which shows the increase in world use of electricity for mining and refining virgin aluminum has increased since the 1950s. Given that the production of aluminum has become more energy- efficient, how do you account for the current global increase in electricity used in aluminum production?

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600 500 200 100 1950 1960 1970 1980 1990 2000 2010 Year Electricity used gbbally to produce aluminum, billion kibwatt-hours