stokes stokes:
Mexico is pretty close to the equator, but it is global warming and not their geographical location that is causing this....
Methinks you need to glance at a globe sometime. 
The Equator isn't anywhere close to Mexico - it runs through South America (Ecuador, Columbia and Brazil specifically). Google maps places the distance at well over 2000 km. Saying Mexico is close to the equator is like saying Edmonton is close to Las Vegas. 
And as the article notes;
$1:
“The thickest was originally about 90 meters in depth,” he said. “Now it is 10 meters at most.”
Yeah, it must the sudden appearance of the equator that has caused it to shrink from 90 metres deep to 10.