>You can't grow more iron ore Steel is perfectly recyclable, but even then there is plenty of iron on earth. We won't be running out of iron. Edit: Of course,

>You can't grow more iron ore Steel is perfectly recyclable, but even then there is plenty of iron on earth. We won't be running out of iron. Edit: Of course, steel is just a name of class of alloys - some of the steel types have a rarer elements like Mo, Ti, V...