‘Warmer temperatures may cause more girl births’ – ‘New study forewarns an unexpected effect of climate change: more girl births than boy births’
'Extreme weather events, like a very hot summer in 2010 and a very cold winter in 2011, were correlated with increased miscarriages of male fetuses, while female fetuses seemed to be able to withstand the disruption'
http://www.treehugger.com/natural-sciences/warmer-temperatures-may-cause-more-girl-births.html