Research shows that if a turtles eggs incubate above 31° Celsius the hatchlings will be female. Researchers have also noted that the warmer the sand, the higher the ratio of female turtles. As the Earth experiences climate change, increased temperatures could result in skewed and even lethal incubation conditions, which would impact turtle species and other reptiles. Read more here: What causes a sea turtle to be born male or female? (noaa.gov)