Infra-X

Saturday, June 28, 2025

Most of the increase in natural disasters in the late 20th century is due to improved reporting—

Tracking the occurrence of natural disasters can save lives by helping countries prepare for future ones.

In our work on natural disasters, we visualize data from EM-DAT, the most comprehensive international disaster database. Make a chart of the number of recorded disaster events over time — like the one here — and it looks like the number of disasters rose alarmingly from the 1970s to the millennium. This has led to many media outlets and organizations claiming that the number of disasters has quadrupled over the last 50 years.

However, as EM-DAT itself makes clear, most of this is due to improvements in recording. The Centre for Research on the Epidemiology of Disasters, which builds this database, was not established until 1973, and didn’t start publishing EM-DAT until 1988.

The number of recorded disasters increased due to more focused efforts to obtain globally comprehensive data and improvements in communication technologies, which allowed more events to be included, even in the planet's most remote areas.

EM-DAT suggests that only data from 2000 onwards is relatively complete and comparable. The number of events before 2000 is likely to be underestimated. Note that this data does not tell us anything about the intensity of disasters.

(This Data Insight was written by Hannah Ritchie.)

Read Hannah Ritchie and Pablo Rosado’s full article on the limitations of disaster databases: https://ourworldindata.org/disaster-database-limitations

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