Fertility – a new early warning indicator?
It has long been recognised that some members of the animal kingdom are able to vary the fertility of their species depending on climatic temperature (if you're interested, look up 'temperature dependent sex determination'). This effect is typically thought to be evident only in reptiles and fish, but according to research published last month by Kasey Buckles, Daniel Hungerman and Steven Lugauer, it may be that humans have achieved something remarkably similar¹. Picked up by Monday's edition of the Financial