DULUTH (AP) -- The Twin Ports of Duluth-Superior recorded its lowest level of coal cargo in three decades during the 2019 shipping season.

The decline in coal comes as demand for renewable energy sent a record 306,000 freight tons of wind turbines and other components for producing wind energy through the port.

The U.S. Energy Information Administration projects coal will produce less than a quarter of the world's electricity by 2050, while renewable energy sources are expected to grow more than 20% during the same time span.

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