![Svante Arrhenius / Arrhenius / Ecology / Extinction / Human extinction / George Perkins Marsh / Svante / Guy Stewart Callendar / Conservation / Environment / Panspermia Svante Arrhenius / Arrhenius / Ecology / Extinction / Human extinction / George Perkins Marsh / Svante / Guy Stewart Callendar / Conservation / Environment / Panspermia](https://www.pdfsearch.io/img/a0b352ea7542f91db06edbe4ebdb7aa8.jpg) Date: 2014-02-28 17:17:59Svante Arrhenius Arrhenius Ecology Extinction Human extinction George Perkins Marsh Svante Guy Stewart Callendar Conservation Environment Panspermia | | More than any other time in human history, mankind faces a crossroads. One path leads to despair and utter hopelessness. The other, to total extinction. Let us pray we have the wisdom to choose correctly. Woody Allen
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