As many as one in five deaths in Bangladesh may be tied to naturally occurring arsenic in the drinking water; it is the epicenter of a worldwide problem that is affecting tens of millions of people. For two decades, health specialists and earth scientists from Columbia University have been trying to understand the problem, and how to solve it.


When did a year last 415 days, a day just 21 hours, and why? Clues to a different world in the Devonian inside Columbia University’s Low Library, in the Burden Room. First in a series for The Earth Institute (you can watch the full series here).

The rest of the Geology Tour:

Building blocks from the Mississippian Sea:

At the corner of Mudd Hall, the secret of blue quartz:

Seeing red: the great oxygenation event

Orogenous zones: how rock flows:

Watch your step: the alpha predator of the Ordovician:

Alma Mater’s other secret: a way forward on climate:


Researcher Guleed Ali explores clues to past climate — and the future prospects for drought — at California’s Mono Lake.


Along a quiet riverbank in the Amazon delta, Rosario Costa Cabral works her farm in the forest, and experiments with ways to adapt to climate change.



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