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New Delhi, Sep 09 (ANI): University of Massachusetts Amherst environmental health scientist has developed an "overlooked hypothesis" to help explain the projected global population decline beginning in 2064: social stress. The article was published in the journal Endocrinology. Stress from social media and other largely empty or overwhelming social interactions may be leading or contributing to changes in reproductive behavior and reproductive physiology, suggests Alexander Suvorov, associate professor in the UMass Amherst School of Public Health and Health Sciences. Over the past 50 years, a 50 per cent decrease in sperm counts has occurred. Stress is known to suppress sperm count, ovulation, and sexual activity, Suvorov notes. While changes in reproductive physiology are usually attributed to the effects of endocrine-disrupting pollutants, Suvorov believes it is not the only factor.