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1、Canary in the mine,The classic example of animals serving as sentinels is the canary in the coal mine.,Climate canary is a new term coined to denote a portent of an environmental catastrophe caused by climate change.,The canary in the phrase refers to the canary in the coal mine a canary would be th
2、e first victim in a coal mine that has toxic gases in the air;its death would warn the miners of danger.,Well into the 20th century,coal miners in the United Kingdom and the United States brought canaries into coal mines as an early-warning signal for toxic gases including methane and carbon monoxide.,he birds,being more sensitive,would become sick before the miners,who would then have a chance to escape or put on protective respirators.,thank you!,
