As recently as the 1980s, coal miners would carry a canary with them as they dug their quarries deep in the earth. Canaries are sensitive to toxic gases such as carbon monoxide and methane; the birds therefore became a kind of early warning system. When a canary started to show signs of distress, miners knew … Continue reading A Canary in the Coal Mine for U.S. Global Leadership?
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A Canary in the Coal Mine for U.S. Global Leadership?
As recently as the 1980s, coal miners would carry a canary with them as they dug their quarries deep in the earth. Canaries are sensitive to toxic gases such as carbon monoxide and methane; the birds therefore became a kind of early warning system. When a canary started to show signs of distress, miners knew … Continue reading A Canary in the Coal Mine for U.S. Global Leadership?