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Research and data to make progress against the world’s largest problems.
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Population tool: how will populations across the world change in the 21st century?

2026-05-18 08:00:00

We created an interactive tool that lets you test how changes in fertility rates, life expectancy, and migration rates will change future populations.<br><br><a href="https://ourworldindata.org/population-simulation-tool"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/95c9945f-c253-4abe-cb79-a28adf7aea00/w=1024"/></a>

South Korea’s population is set to shrink: what would it take to stop the decline?

2026-05-18 08:00:00

How much would fertility rates, life expectancy, or migration rates need to change to stop the population from shrinking?<br><br><a href="https://ourworldindata.org/south-koreas-population-is-set-to-shrink-what-would-it-take-to-stop-the-decline"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/133452ba-5209-482d-089c-c51f5b48b900/w=1024"/></a>

Childhood stunting fell dramatically over the 20th century

2026-05-11 08:00:00

What can countries with high stunting rates today learn from Japan’s experience of going from 70% to 5%?<br><br><a href="https://ourworldindata.org/childhood-stunting-fell-dramatically-over-the-20th-century"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/c72d18f2-3c36-42d5-52da-02339ee93900/w=1024"/></a>

Most people care about farm animals — our food system doesn't reflect that

2026-04-20 08:00:00

Surveys worldwide show that most people find common animal farming practices unacceptable, even where meat consumption is high.<br><br><a href="https://ourworldindata.org/most-people-care-about-farm-animals-our-food-system-doesnt-reflect-that"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/e8c1792e-598e-4cd7-7a1a-309ed38b3800/w=1024"/></a>

We’re looking for a writer

2026-04-15 08:00:00

We’re hiring a writer who can make the world’s largest problems understandable to our large Our World in Data audience.<br><br><a href="https://ourworldindata.org/hiring-writer-2026"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/014e8530-1d3d-409d-136d-467639157700/w=1024"/></a>

What do people die from in different countries?

2026-04-13 08:00:00

Explore causes of death data for all countries, spanning more than four decades.<br><br><a href="https://ourworldindata.org/what-do-people-die-from-in-different-countries"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/b18a3db6-93e7-4e72-3afa-ffae811d6800/w=1024"/></a>