Editor's Picks: Stop the train

In this episode of The Geographical Podcast, we read out articles from our print magazine or website.This week, we report on the campaign to save Mexico’s famous cenotes – natural sinkholes that form the second longest underwater cave system in the world, as well as the country’s largest and most important freshwater aquifer – from the construction of the Maya Train.Also in this episode, we hear how from a researcher who has discovered evidence of giant viruses in Greenland, and what they could mean for the melting ice sheet. Find the episode here, or wherever you usually listen to podcasts: