I really like this - especially the way you've shown what our world would be like if an ice age happened, and the need to find watering holes (I guess for the fish as much as for liquid drinking water !).

When I was at school (long before global warming was invented) we were taught that modern history is just a warm period between two ice ages and that soon enough the world would freeze again. Then research showed that when an ice age struck, it happened fast, on a scale of 100-1000 years. It's logical enough that there would be times when earth is colder than now, and times when it's warmer.

!BBH
!LOLZ
!PIZZA