Tue, Apr 18, 2006
The scientific community took some time to accept the evidence that the level of sunlight reaching the Earth's surface had declined in recent decades because, from a narrow minded perspective, it seemed to contradict the phenomenon of global warming. Nova follows the scientists working to find the cause of global dimming but the emphasis of the program is a stern warning about global worming.
Tue, Sep 26, 2006
An eruption of a megavolcano may be the most likely cataclysmic event the earth faces in the present day. Four scientists independently uncover evidence of such an eruption just 75,000 years ago that radically altered the global climate for a millennium and probably disrupted human colonization of the earth.