Researchers have said that sperm count among men seems to have reduced over 40 years after assessing results on nearly 200 studies.
Speaking to BBC, the lead researcher, Dr Hagai Levine said that if the trend continues human would become extinct and that he is 'very worried' of what might happen in the future.
"If we will not change the ways that we are living and the environment and the chemicals that we are exposed to, I am very worried about what will happen in the future," he said.
"Eventually we may have a problem, and with reproduction in general, and it may be the extinction of the human species.”
Dr Levine Hagai during his research found that there was a 59 per cent decline in total sperm count and a 52.4 per cent decline in sperm concentration from men in New Zealand, North America, Australia and Europe.
A lot of previous studies indicated the same sharp declines in sperm count in most of the developed countries although sceptics say that a number of the studies have been flawed.
According to Dr Levine, exposure to chemicals, watching too much TV , diet, stress, obesity and smoking could be a reason for the apparent decline in sperm count.