BOULDER, Colo., March 28 (UPI) -- An ancient asteroid impact may have caused a global firestorm on Earth that burned every twig, bush and tree on the planet, U.S. researchers say.
An asteroid the size of Manhattan that slammed into a region of Mexico in the dinosaur era could have triggered a worldwide firestorm that led to the extinction of 80 percent of all Earth's species, a University of Colorado Boulder study suggests.