Our eldest grandchild, Abby, is in the 8th grade now. I was in the same grade in 1962. I marvel at how much life on Earth has changed since then–not just human lives but the state of all life on the planet. Amazing, the degree of change our one species has caused in the geological blink of an eye is comparable in magnitude only to the shifts between eras caused by colliding continents, super-volcanic millennia or massive meteors slamming into Earth. My generation has …

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