[skhunted]

The Panama Canal is having problems now due to a prolonged drought. There have already been migrations from Guatemala and Honduras due to droughts in the highlands. Mexico City is facing a water problem partially due to drought.

From NASA: Increased evaporation will result in more frequent and intense storms, but will also contribute to drying over some land areas.

Don't know if Central America in particular will dry out in the long term. Was just using it as an example of the types of migrations that will come from global warming. Please try to understand the overall point and not pedantically nitpick.