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Research and data to make progress against the world’s largest problems.
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“Cool” years are now hotter than the “warm” years of the past: tracking global temperatures through El Niño and La Niña

2025-03-03 12:00:00

The world is warming despite natural fluctuations from the El Niño cycle.<br><br><a href="https://ourworldindata.org/global-temperatures-el-nino-la-nina" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/40c0d7fb-f503-45b1-8eda-8cc001f4dd00/w=1350"/></a>

The baby boom in seven charts

2025-02-24 12:10:00

The baby boom reshaped family life and drove population growth in many countries. In this article, we explore the key patterns in seven charts.<br><br><a href="https://ourworldindata.org/baby-boom-seven-charts" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/8ef118fd-a238-4212-76af-2674b5b4d300/w=1350"/></a>

Why the total fertility rate doesn’t necessarily tell us the number of births women eventually have

2025-02-24 12:05:00

The fertility rate is commonly confused with the eventual number of births per woman. This can result in misinterpreting the impact of policies and trends over time.<br><br><a href="https://ourworldindata.org/total-fertility-rate-births-per-woman" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/07feefbb-15b0-4bbe-6a26-894e38507400/w=1350"/></a>

Explore changing patterns in fertility worldwide

2025-02-24 12:00:00

Data on fertility rates, ages of mothers and fathers at childbirth, twin births, reproductive technologies, contraception, and more.<br><br><a href="https://ourworldindata.org/fertility-rate" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/22159485-fcb9-4811-8ca9-93644ffade00/w=1350"/></a>

In many countries, people breathe the cleanest air in centuries. What can the rest of the world learn from this?

2025-02-17 12:00:00

Air pollution tends to get worse before it gets better, but how can we accelerate this transition?<br><br><a href="https://ourworldindata.org/cleanest-air-lessons" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/2634177d-6b60-4df5-3152-c38263399f00/w=1350"/></a>

Our founder, Max Roser, has received two prestigious honors

2025-02-10 12:00:00

An honorary doctorate from KU Leuven & UCLouvain and a “Dove of Peace” in Germany.<br><br><a href="https://ourworldindata.org/max-roser-received-two-prestigious-honors" target="_blank"><img src="https://ourworldindata.org/cdn-cgi/imagedelivery/qLq-8BTgXU8yG0N6HnOy8g/679eea1d-ea22-4824-cccd-6b2044447a00/w=1350"/></a>