Study warns of population challenge

The world faces deepening challenges in the 21st century from an expanding population and limited resources, according to a new report from a British-based scientific group.

Nobel laureate John Sulston, a professor at the University of Manchester, said in a presentation at the United Nations today that “the 21st century is clearly a critical period” as global population grows from 7 billion in 2011 to 11 billion or more by 2050.