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What are the safest and cleanest sources of energy?
Fossil fuels are the dirtiest and most dangerous energy sources, while nuclear and modern renewable energy sources are vastly safer and cleaner.
Most cited
Posts that commenters keep linking to, ranked by how many different people have cited them in Hacker News comments. 122 posts.
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CO₂ emissions
How much CO₂ does the world emit? Which countries emit the most?
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Coronavirus (COVID-19) Vaccinations
Explore data on COVID-19 vaccinations across the world.
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Breakdown of carbon dioxide, methane, and nitrous oxide emissions by sector
How much do electricity, transport, and land use contribute to different greenhouse gas emissions?
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Excess mortality from March to December of 2020
Explore data on COVID-19 excess mortality across the world.
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You want to reduce the carbon footprint of your food? Focus on what you eat, not whether your food is local
“Eat local” is a common recommendation to reduce your diet's carbon footprint. How does the impact of what you eat compare to where it comes from?
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Why did renewables become so cheap so fast?
In most places, power from new renewables is now cheaper than new fossil fuels.
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Plastic Pollution
How much plastic ends up in the ocean? Where does it come from?
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COVID-19 Pandemic
The COVID-19 pandemic has had a profound impact on the world. Explore global data and research to understand its impact, spread, and global response.
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Novel Coronavirus situation reports
The Weekly Epidemiological Update provides an overview of the global, regional and country-level COVID-19 cases and deaths, highlighting key data and trends; as well as other pertinent epidemiological information concerning the COVID-19 pandemic.
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Mass Incarceration: The Whole Pie 2020
Report showing the number of people who are locked up in the United States and why
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Fact Sheet | Fossil Fuel Subsidies: A Closer Look at Tax Breaks and Societal Costs (2019) | White Papers
See our latest white papers on fossil fuel subsidies and fossil fuel externalities .
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Mortality Risk of COVID-19
Explore data on the mortality risk of COVID-19 across the world.
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When and how to use masks
WHO's guidance and advice on the use of masks to protect against and limit the spread of COVID-19.
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Environmental Impacts of Food Production
What are the environmental impacts of food production? How do we reduce the impacts of agriculture on the environment?
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About One-in-Four U.S. Hispanics Have Heard of Latinx, but Just 3% Use It
The term Latinx has emerged in recent years as a gender-neutral alternative to the pan-ethnic terms Latino, Latina and Hispanic. However, awareness of Latinx is relatively low among the population it is meant to describe.
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Adversarial Interoperability
“Interoperability” is the act of making a new product or service work with an existing product or service: modern civilization depends on the standards and practices that allow you to put any dish into a dishwasher or any USB charger into any car’s cigarette lighter.But interoperability is just the...
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Long COVID: Lasting effects of COVID-19
COVID-19 can have lasting symptoms that affect many parts of the body. Learn more about the symptoms and effects of long COVID.
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Half of the world’s habitable land is used for agriculture
More than three-quarters of global agricultural land is used for livestock, despite meat and dairy making up a much smaller share of the world's protein and calories.
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What the data says about immigrants in the U.S.
As of June 2025, the country’s foreign-born population had shrunk by more than a million people, marking its first decline since the 1960s.
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Gallup: 81% of Black Americans Want Police to Retain Local Presence
It's not so much the volume of interactions Black Americans have with the police that troubles them or differentiates them from other racial groups, but rather the quality of those interactions.
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Two-Thirds of Americans Think Government Should Do More on Climate
There is bipartisan support for several proposals to reduce the effects of climate change, especially for large scale tree-plantings to help absorb carbon emissions and offering tax credits to businesses that capture carbon emissions.
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Sizing Up Twitter Users
Twitter users are younger, more likely to identify as Democrats, more highly educated and have higher incomes than U.S. adults overall.
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What share of global CO₂ emissions come from aviation?
Aviation accounts for 2.5% of global CO₂ emissions. But it has contributed around 4% to global warming to date.
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Employers steal billions from workers’ paychecks each year: Survey data show millions of workers are paid less than the minimum wage, at significant cost to taxpayers and state economies
This report assesses the prevalence and magnitude of one form of wage theft—minimum wage violations (workers being paid at an effective hourly rate below the binding minimum wage)—in the 10 most populous U.S. states. We find that, in these states, 2.4 million workers lose $8 billion annually (an average of $3,300 per…
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Not just “a few bad apples”: U.S. police kill civilians at much higher rates than other countries
Police violence is a systemic problem in the U.S., not simply incidental, and it happens on a scale far greater than other wealthy nations.
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Who has contributed most to global CO2 emissions?
Our impact on climate change is not just about emissions that occur today. How much we emitted in the past also matters.
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Coronavirus disease (COVID-19)
WHO is continuously monitoring and responding to this pandemic. This questions and answers page will be updated as more is known about COVID-19, how it spreads and how it is affecting people worldwide. For more information, regularly check the WHO coronavirus pages. https://www.who.int/covid-19