Date: 2014-02-28 17:17:59

Svante 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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