Australian scientists have been tracking the population of green sea turtles in the Great Barrier Reef and almost 100 percent of the young being born are girl turtles.

Unlike humans and most other mammals, the sex of reptiles like turtles is determined by an egg's incubation temperature, not chromosomes.

Warmer temperatures mean more female turtles are born. Cooler temperatures lead to more males.

There's a range of only a few degrees separating the possibility of nearly equal males and females and 100 percent of one sex or the other. That points to the overall warming trend in the Great Barrier Reef as the cause.

The future really is female.