By Cassandra Garrison and Jose Luis Gonzalez MEXICO CITY (Reuters) - Parts of Mexico's remote southern jungles have barely changed since the time of t.
Collapse, contamination: Mexican scientists sound alarm at Mayan Train gazette.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gazette.com Daily Mail and Mail on Sunday newspapers.
If built badly, the railway risks breaking through the fragile ground, including into yet-to-be explored caves below, says Emiliano Monroy-Rios, a Mexican geochemist with Northwestern University who has extensively studied the area's caves and cenotes. Diesel, he adds, could also leak into the network of subterranean pools and rivers, the main source of fresh water on the peninsula.