Investors look at computer screens showing stock information at brokerage house in Qingdao, Shandong Province, China, January 11, 2016. REUTERS/China Daily

(FILES) This file photo taken on November 22, 2015 shows a dying Joshua Tree as the drought affects the state in Joshua Tree National Park, California. A warming planet might not dry out Earth as much as previously believed, because plants will become less thirsty as carbon dioxide in the atmosphere rises, researchers said on August 29, 2016. Previous studies have projected that more than 70 percent of the planet will experience more drought as carbon-dioxide levels quadruple from pre-industrial levels over about the next 100 years, said the report in the Proceedings of the National Academy of Sciences. / AFP PHOTO / MARK RALSTONMARK RALSTON/AFP/Getty Images

A man types on a computer keyboard in Warsaw in this February 28, 2013 illustration file picture. REUTERS/Kacper Pempel/Files

This handout photo released by the Nature on August 29, 2016 shows University of Texas Austin professor John Kappelman with 3D printouts of the skeleton of Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, illustrating the compressive fractures in her right humerus that she suffered at the time of her death. Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, died from injuries she sustained having fallen out of a tree, finds a study published in Nature this week. The study, which analyses the fractures on parts of Lucys skeleton, offers unusual evidence for the presence of tree dwelling (arborealism) in the extinct hominin Australopithecus afarensis. John Kappelman and colleagues studied the fossil which includes elements of the skull, hand, axial skeleton, pelvis and foot and computed tomographic scans of the skeleton in order to assess the cause of death. Detailed analysis of the damage to the skeleton and comparison with clinical cases reveals that many of the fractures are likely to have been sustained at the time of death rather than post-mortem, and are probably the result of a fall and impact from considerable height as opposed to fossilization processes. Such a fall is consistent with the location and severity of the fractures observed in multiple skeletal elements, the authors explain. Furthermore, analysis of the fractures in Lucys upper arms suggests that she stretched out her arms in an attempt to break her fall. / AFP PHOTO / NATURE PUBLISHING GROUP / Marsha MILLER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NATURE / MARSHA MILLER " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS MARSHA MILLER/AFP/Getty Images

This handout photo released by the Nature on August 29, 2016 shows the distal radius of Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, undergoing computed tomographic scanning. Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, died from injuries she sustained having fallen out of a tree, finds a study published in Nature this week. The study, which analyses the fractures on parts of Lucys skeleton, offers unusual evidence for the presence of tree dwelling (arborealism) in the extinct hominin Australopithecus afarensis. John Kappelman and colleagues studied the fossil which includes elements of the skull, hand, axial skeleton, pelvis and foot and computed tomographic scans of the skeleton in order to assess the cause of death. Detailed analysis of the damage to the skeleton and comparison with clinical cases reveals that many of the fractures are likely to have been sustained at the time of death rather than post-mortem, and are probably the result of a fall and impact from considerable height as opposed to fossilization processes. Such a fall is consistent with the location and severity of the fractures observed in multiple skeletal elements, the authors explain. Furthermore, analysis of the fractures in Lucys upper arms suggests that she stretched out her arms in an attempt to break her fall. / AFP PHOTO / NATURE PUBLISHING GROUP / Marsha MILLER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NATURE / MARSHA MILLER " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS MARSHA MILLER/AFP/Getty Images

This handout photo released by the Nature on August 29, 2016 shows University of Texas Austin professors John Kappelman (L) and Richard Ketcham examining casts of Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, while scanning the original fossil. Lucy, the iconic 3.18-million-year-old hominin found in present-day Ethiopia, died from injuries she sustained having fallen out of a tree, finds a study published in Nature this week. The study, which analyses the fractures on parts of Lucys skeleton, offers unusual evidence for the presence of tree dwelling (arborealism) in the extinct hominin Australopithecus afarensis. John Kappelman and colleagues studied the fossil which includes elements of the skull, hand, axial skeleton, pelvis and foot and computed tomographic scans of the skeleton in order to assess the cause of death. Detailed analysis of the damage to the skeleton and comparison with clinical cases reveals that many of the fractures are likely to have been sustained at the time of death rather than post-mortem, and are probably the result of a fall and impact from considerable height as opposed to fossilization processes. Such a fall is consistent with the location and severity of the fractures observed in multiple skeletal elements, the authors explain. Furthermore, analysis of the fractures in Lucys upper arms suggests that she stretched out her arms in an attempt to break her fall. / AFP PHOTO / NATURE PUBLISHING GROUP / Marsha MILLER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NATURE / MARSHA MILLER " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS MARSHA MILLER/AFP/Getty Images

An illustration picture shows a projection of binary code on a man holding a laptop computer, in an office in Warsaw June 24, 2013. REUTERS/Kacper Pempel/Files

This handout picture released by the Vatican press office shows Pope Francis (L) during a meeting with Facebook founder and CEO Mark Zuckerberg on August 29, 2016 at the Vatican. Vatican spokesman Greg Burke said the meeting was focused on how to use communication technologies to alleviate poverty, encourage a culture of encounter, and make a message of hope arrive, especially to those most in need." / AFP PHOTO / OSSERVATORE ROMANO AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / OSSERVATORE ROMANO" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images