Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
by Staff Writers
St. Andrews, Scotland (UPI) Jul 2, 2013
Scientists have set a new date for the end of the world, when all animals and plants will vanish from Earth -- but it'll take another 2 billion years.
While increases of carbon dioxide in the atmosphere have people concerned about the planet's future, the scientists say it will in fact be a lack of the greenhouse gas that will bring the end to life, the Daily Telegraph reported Tuesday.
In less than a billion years, as the sun ages and grows hotter, and greater evaporation and chemical reactions with rainwater take away more and more carbon dioxide, its levels will be too low for photosynthesizing plants to survive, they say.
Herbivorous animals will die out with the loss of plants, and carnivores will die off when they can no longer prey on herbivores -- and life as we know it will cease to exist on Earth.
"The far-future Earth will be very hostile to life by this point," astrobiologist Jack O'Malley-James of the University of St Andrews in Scotland said. "All living things require liquid water, so any remaining life will be restricted to pockets of liquid water, perhaps at cooler, higher altitudes or in caves underground."
The only surviving organisms -- hardy microbes known as extremophiles -- would have to cope with extreme high temperatures and intense ultraviolet radiation that would likely kill them off eventually, he said.
O'Malley-James said he based his predictions on a computer simulation of the impact long-term changes to the sun are likely to have on Earth.
Darwin Today At TerraDaily.com
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|