This is another example of a scary head line with no real substance. The study does not say anything about the age of the men. We know that sperm count will go down with age. Also, it does not address the birth rates. Who cares if we have 1/2 the sperm count we had 20 years ago if we are having more kids. That is the case by the way. Even in western countries, where the birth rate has slowed, they are still having ebough kids to replace their populations. There are about 7.5 billion people on the panet and we are not slowing down.