Debthink
I manage Restore Mass Ave, an environmental non profit that adds urban forest​ in Washington DC. Debthink is my personal site for posting about science and the environment, with info about my books.
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Entries in bighorn sheep (1)

Thursday
Sep102009

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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