The reproductive health of the average male is in sharp decline, the world's largest study of the quality and concentration of sperm has found.
Between 1989 and 2005, average sperm counts fell by a third in the study of 26,000 men, increasing their risk of infertility. The amount of healthy sperm was also reduced, by a similar proportion.
The article goes on to list things you can do raise your own sperm count.
My question, like many of the commenters, is why do we want to? Why would it be a bad thing to have lower sperm counts planet wide?