I was reading this article about millions of years ago and some of their reasoning sounds very similar to what we are hearing today about extremes in weather (except now humans are being blamed). Maybe, in the big picture the Earth's weather is ever changing??
Mystery solved: Why large dinosaurs avoided the tropics for millions of years
http://www.foxnews.com/science/2015/06/17/why-large-dinosaurs-avoided-tropics-for-millions-years/
Mystery solved: Why large dinosaurs avoided the tropics for millions of years
http://www.foxnews.com/science/2015/06/17/why-large-dinosaurs-avoided-tropics-for-millions-years/