About This Project

Uncovering the planet’s hidden climate change

Reuters journalists spent more than a year sifting through data, collecting stories and visualizing the results to bring you this series.


This project began with a little moment: Reporter Maurice “Mo” Tamman, who lives on a sailboat in New York Harbor, noticed fish in nearby waters that were normally found farther south. He started digging into the data, and he discovered that marine creatures are fleeing warming seas, in an epic underwater refugee crisis.

To examine sea surface temperatures and identify hotspots, he used data from the U.S. National Oceanic and Atmospheric Administration. The data estimated the mean monthly temperature in one-degree grids for the seas across the planet starting in 1970.

To explore the migrations of marine creatures, he used federal trawl survey data in the U.S. North Atlantic. This tracks the location of dozens of species dating to the late 1960s. He chose this data set because it’s one of the oldest in the world and has maintained consistent methods throughout, making its numbers comparable over time. Using a Rutgers University version of the data called OceanAdapt, which is enhanced by adding the geographic center of each species’ range, he was  able to quantify the number of species that had shifted north, or deeper, or both.

Maurice Tamman, data journalist and investigative reporter, lives aboard Zennora, a 53-foot sailboat, in New York Harbor. He explains how we conceived and reported this series.

He also used U.S. Coast Guard data on documented vessels to identify where the country’s newest fleets were located, which pointed to Maine and lobster fishing. And he used NOAA data on the home port of vessels that landed summer flounder in Virginia and North Carolina. Beyond the United States, he relied on United Nations and national fish-landings data, various stock assessments and published academic papers.

This number-crunching, though, was just the first part of the journey. Dozens of Reuters journalists have since joined Mo to create this multipart series.

From Stonington, Maine, to Hakodate, Japan, reporters found the intimate stories of people who have been affected by this global marine migration. In addition to filing hundreds of traditional images that captured a rapidly changing world, photographers shot drone footage on the West African coast and 360-degree pictures of mangrove destruction in Borneo. Visual storytellers spent months making the data come alive and bringing you Norway’s Silicon Valley of the Sea. And finally, an artist in South Africa interpreted the series with a set of  illustrations.

This is Reuters’ reach — and its commitment to this important story of the climate crisis beneath the waves.

The project took us to overlooked corners of the seafood industry. Here, workers in America slice up spiny dogfish, sometimes used in British fish-and-chip shops.