The demand for caustic soda, a key material in manufacturing aluminum, is increasing as megatrends in urbanization and population growth provide a push in environmental and energy-efficient construction. Aluminum is lightweight and widely recycled, making it ideal for building infrastructure in densely populated and urbanizing areas. "All of this together, we believe, is going to drive demand in the next 10 years," said Klaus Kleinfeld, CEO of aluminum maker Alcoa.

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