Climate change may also negatively impact male fertility, with several animal studies suggesting that sperm are especially vulnerable to the effects of increasing temperatures. Heatwaves have been shown to damage sperm in insects, and a similar impact has been observed in humans. A 2022 study found that high ambient temperature – due to global warming, or working in a hot environment – negatively affects sperm quality.
https://www.bbc.com/future/article/20230327-how-pollution-is-causing-a-male-fertility-crisis