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coal
Example Sentences
Because it traps ancient air bubbles, ice is the only climatic archive of the atmosphere of the past and thus of greenhouse gas concentrations before the industrial burning of coal, oil and gas.
That matters less when one of the cheapest sources of electricity in many developing nations these days isn’t coal but solar panels paired with batteries, both made in China.
If the film is intended to be a canary in a coal mine, that bird has long since expired.
When it comes to signs of economic disruption, logistics companies are the canaries in the coal mine.
Comedy is the canary in the coal mine for free speech.
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From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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