Elizabeth Leahy Madsen

Elizabeth Leahy Madsen is a senior research associate at Population Action International. She leads PAI's research on the connections between population dynamics and broader development issues, including demographic security, and she directs the research components of projects on reproductive health and maternal health supplies.

  • World population projected to hit 7 billion on Oct. 31

          Image: National GeographicToday, the United Nations announced that the world’s population will reach an historic 7 billion people on Oct. 31, 2011. World population hit 1 billion people in 1804. It took 123 years to add the next billion, but …