Most of World's Biggest Beasts Could Be Extinct by 2100

One day, your grandchildren may open their science textbooks and read about elephants, tigers and lions as majestic, extinct creatures that once roamed the Earth like woolly mammoths and Triceratops. That is the message of a new paper, written by dozens of conservation biologists from around the world. To forestall that future, governments and conservation organizations should implement several steps to prevent the mass extinction, the scientists report.