noun
a person or thing that serves as a warning of a dangerous or harmful situation related to climate change
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The climate canary is used as an early warning system for environmental changes.
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The climate canary is like the canary in the coal mine, indicating when things are going wrong.
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If the climate canary starts chirping, we know we need to take action fast.
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The coral reefs are the climate canaries of the ocean, showing the effects of climate change before other ecosystems.