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that there's enough coal to last for many centuries yet. It's simply a matter of how deep you dig. And there are all sorts of ways coming on stream for getting down to deeper
seams of coal and getting gas out of them rather than having to dig out the coal themselves.
So, I don't think there's any chance of running out of coal. At least not before we've invented things to take its place.
Listen to native speakers pronounce “seams” in real conversational contexts with synchronized timestamps and subtitles.