Earth Day 2013: the 'pale blue dot' in quotations

9. Hand-me-down

Ian Joughin/AP/File
Surface melt water rushes along the surface of the Greenland Ice Sheet through a supra-glacial stream channel, southwest of Ilulissat, Greenland.

"[W]e must recognize our grave duty to hand the earth on to future generations in such a condition that they too can worthily inhabit it and continue to cultivate it."

Pope Benedict XVI, "Caritas in Veritate," 2009

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