Grand Canyon thoughts: Could humans start a new geological age?

August 2009

In dawn’s early light it was dim and cool on the porch. But my usual stroll across the lawn to the edge of Grand Canyon was blocked by four large animals grazing, as if the lawn was theirs not mine.   

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Acidifying oceans remake Earth and our food supply

March 2008

What’s happening in the world’s oceans? To the known problems of overfishing, pollution, and invasive organisms borne on ship hulls, we can add the lesser-known alterations caused by climate change

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