Carl Sagan Quote

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.

Billions & Billions: Thoughts on Life and Death at the Brink of the Millennium (ed. Ballantine Books, 2011) - ISBN: 9780307801029