How we choose which topics to work on, and which metrics to provide
On Our World in Data, we present thousands of metrics on hundreds of topics. How do we choose them?
Latest:Our latest articles, updates and announcements
We just redesigned our work on Waste Management
Explore data visualizations on waste management.We published a redesign of our work on the Environmental Impacts of Food
We published a major redesign of our work on the Environmental Impacts of Food. Explore all of our data and research in one place.Technology over the long run: zoom out to see how dramatically the world can change within a lifetime
It is easy to underestimate the magnitude of this change. Understanding this can help us see how different the world could be in the future.What does it mean for a species to be at risk of extinction?
We need to focus on the most threatened species to protect them from extinction. But what does it mean for a species to be at risk, and how is it measured?We published a redesign of our work on Light at Night
On this page, you can find data, visualizations, and writing about changes in efficiency, price, and access to lighting.AI timelines: What do experts in artificial intelligence expect for the future?
Many believe there is a real chance that human-level AI will be developed within the next decades, and some believe that it will exist much sooner.We published a redesign of our work on Democracy
We published a major redesign of our work on Democracy. Explore all our data and research in one place.We published a redesign of our work on Food Prices
On this page, you can find data, visualizations, and writing on global and country-level food prices and expenditures, the affordability of food, and how this has changed over time.Engel's Law: Richer people spend more money on food, but it makes up a smaller share of their income
How does spending on food change as incomes rise?We redesigned our work on Military Personnel and Spending
Explore global data and visualizations on military personnel and spending on this page.We just published a redesign of our work on Tourism
Tourism has massively increased in recent decades. Explore data and visualizations on the history and current state of tourism across the world on this page.How many people die and how many are born each year?
Changes in the world population are determined by two metrics: the number of babies born and the number of people dying.We just published a redesign of our work on Agricultural Production
Agricultural production is not only fundamental to improving nutrition, but is also the main source of income for many. Explore data and visualizations relating to the topic on this page.We just published a redesign of our work on Books
Books and written communication have played a crucial role in the spread of ideas and the development of culture. Explore historical data on manuscript and book production.We just published a redesign of our work on Biodiversity
We just published a major redesign of our work on Biodiversity. Explore all our data and research in one place.Wild mammals make up only a few percent of the world’s mammals
Livestock make up 62% of the world’s mammal biomass; humans account for 34%; and wild mammals are just 4%.Artificial intelligence is transforming our world — it is on all of us to make sure that it goes well
How AI gets built is currently decided by a small group of technologists. It should be in all of our interest to become informed and engaged.The brief history of artificial intelligence: the world has changed fast — what might be next?
Little is as important for the world’s future and our own lives as how this history continues.We just published a new topic page on Artificial Intelligence
AI is already having a large impact on our world. Explore research and data to understand the trajectory of this important technology.There have been five mass extinctions in Earth's history
When did the "Big Five" mass extinctions happen, and what were their causes?