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The canary in the coal mine

THE CANARY IN THE COAL MINE

Today, we have all sorts of sophisticated monitoring devices.  We have ways to measure the amount of mercury in tuna fish, or radon in our basements.  We have warning alarms for our homes to measure dangerous gas leaks.  But these devices are fairly new.  Before that, we used animals to alert us of a problem. These animals were among a classification called sentinel species.  I remember seeing dogs with high school students pass me in the hallway on their way to their next class. These dogs...

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