Gaskins AJ, Mínguez-Alarcón L, VoPham T, et al. - Researchers conducted this prospective cohort study investigating the correlation between ambient temperature and antral follicle count (AFC), a standard measure of ovarian reserve. They estimated daily temperature at the residential address of 631 women, who attended the Massachusetts General Hospital Fertility Center (2005–2015) who participated in the Environment and Reproductive Health Study, for the 90 days before their antral follicle scan utilizing a spatially refined gridded climate data set. A 1°C increase in average maximum temperature during the 90 days before ovarian reserve testing was noted to be linked with a −1.6% lower AFC. Overall findings suggest association of exposure to higher temperatures with lower ovarian reserve. Results overall raise concern that increase in ambient temperatures worldwide may lead to accelerated reproductive aging among women.