Mark John Costello

Mark John Costello

Professor in Marine Biology, Nord University

Mark has over 30 years of experience studying marine biodiversity and biogeography, including teaching courses on Marine Protected Areas, supervising over 65 graduate students, and over 270 peer-reviewed publications.

Articles by: Mark John Costello

An underwater photo of corals and tropical fish on the ocean floor

There's an acidic zone 13,000 feet beneath the ocean surface — and it's getting bigger

By Peter Townsend Harris, Mark John Costello published

The carbonate compensation depth — a zone where high pressure and low temperature creates conditions so acidic it dissolves shell and skeleton — could make up half of the global ocean by the end of the century.