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In the 21st century, coal gas has largely been replaced by [[natural gas]] but coke is still made for use as a [[reducing agent]] in the [[steel industry]].
In the 21st century, coal gas has largely been replaced by [[natural gas]] but coke is still made for use as a [[reducing agent]] in the [[steel industry]].
Petroleum coke is a similar material made from crude oil.
Petroleum coke is a similar material made from oil.