"If I can leave a single message with the younger generation, it is to lash yourself to the mast, like Ulysses if you must, to escape the siren calls of complacency and indifference."

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The hole in the ozone layer is a kind of skywriting. At first it seemed to spell out our continuing complacency before a witch's brew of deadly perils. But perhaps it really tells of a newfound talent to work together to protect the global environment.

— Carl Sagan