Alarming new research on falling sperm counts

Kathryn Ryan talks to epidemiologist, Hagai Levine, about new research on falling sperm counts around the world, and what it could mean for humanity. Dr Levine says the results of nearly 200 studies have found that sperm counts among 43,000 men from North America, Europe, Australia, and New Zealand, seem to have halved in less than 40 years.