Johns Hopkins University will stop publishing data on confirmed COVID-19 cases and deaths. Our team will replace our entire time series with WHO's data on 8 March 2023.

On Our World in Data, we present thousands of metrics on hundreds of topics. How do we choose them?

Explore data visualizations on waste management.

We published a major redesign of our work on the Environmental Impacts of Food. Explore all of our data and research in one place.

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.

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?

On this page, you can find data, visualizations, and writing about changes in efficiency, price, and access to lighting.

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 major redesign of our work on Democracy. Explore all our data and research in one place.

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.

How does spending on food change as incomes rise?

Explore global data and visualizations on military personnel and spending on this page.

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.

Changes in the world population are determined by two metrics: the number of babies born and the number of people dying.

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.

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 major redesign of our work on Biodiversity. Explore all our data and research in one place.

Livestock make up 62% of the world’s mammal biomass; humans account for 34%; and wild mammals are just 4%.

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.

Little is as important for the world’s future and our own lives as how this history continues.

AI is already having a large impact on our world. Explore research and data to understand the trajectory of this important technology.