Daily Data Insights
Bite-sized insights on how the world is changing, published every weekday.
August 27, 2024
The number of identified exoplanets has dramatically increased thanks to the “transit method”
Exoplanets are planets that orbit stars other than the Sun. Their existence was first confirmed in 1992 when astronomers Aleksander Wolszczan and Dale Frail identified two exoplanets orbiting a star located 2,300 light-years from Earth.
As shown in this chart, from 1992 to 2005, scientists discovered two hundred more exoplanets. They primarily used a method called "radial velocity". This technique works by detecting small changes in the color of a star due to the gravitational pull of a planet orbiting it.
But starting in the mid-2000s, the "transit method” vastly accelerated the pace of exoplanet discovery. This method detects tiny dips in a star’s brightness when a planet passes in front of it. This dimming can reveal a planet's presence and provide information about its size and orbit.
As is often the case with technological change, what was once a unique scientific achievement has become a much more frequent occurrence. The advancements in detection methods now allow us to discover hundreds of exoplanets each year.
Adding up all methods of identification, more than 5,500 exoplanets have been found by scientists worldwide, according to data from NASA's Exoplanet Archive.
August 26, 2024
People in richer countries tend to eat more meat
Richer people tend to have more diverse diets. They get a lower share of their calories from staples such as cereals, roots, and tubers and increase their consumption of fruit, vegetables, dairy, and meat.
The chart shows the relationship between meat supply and gross domestic product (GDP) per person. Meat supply — as reported by the Food and Agriculture Organization of the United Nations — measures the average quantity of meat available for consumers. It includes how much people ultimately eat and any consumer waste.
There is a strong positive relationship: people in wealthier countries tend to eat more meat per person. This has also meant that as the world has gotten richer, global meat production has increased.
August 23, 2024
Cancer has replaced cardiovascular diseases as the leading cause of death in several wealthy countries
This chart shows the share of reported deaths caused by cardiovascular diseases and cancer since 1950 in Denmark, Australia, the UK, and Canada. This is based on the underlying cause listed on death certificates and comes from the WHO Mortality Database (2024); we recently updated our charts with the latest release.
Fifty years ago, around half of all deaths in these countries were due to cardiovascular diseases. Today, this proportion has dropped to between 20% and 25%. Cancer has become the most common cause of death in many of these countries, even though overall cancer mortality rates have also been declining.
Many factors contribute to these trends, such as declines in smoking and improvements in screening, diagnosis, and monitoring.
These countries are also leading the use of statins, medicines that lower cholesterol, which likely have had a significant effect on reducing heart-related deaths.
Even though fewer people are dying from cardiovascular diseases in some of these wealthy countries, heart disease remains the leading cause of death worldwide.
Read more on the different types of cardiovascular diseases →
August 22, 2024
Drivers of tree cover loss are different in each region
Recent data from Global Forest Watch shows trends in tree cover loss, split by five drivers: forestry, shifting agriculture, and wildfires, which lead to temporary tree cover loss, while commodity-driven deforestation and urbanization often cause permanent deforestation.
This dataset combines time-series data of tree cover loss, estimated from satellite imagery using research by Matthew Hansen and colleagues, with research on the drivers of deforestation by Philip Curtis and colleagues.
The drivers of tree cover loss vary markedly across regions. Wildfires and forestry (logging) are the main drivers of tree cover loss in Europe and North America, with wildfires mainly occurring in Canada and Russia. Tree cover loss from wildfires does not include fire clearing for agriculture.
Commodity-driven deforestation is a key cause in Asia and South America, largely due to trends in Brazil and Indonesia. Shifting agriculture — where trees are cleared so the land can be cultivated temporarily before being abandoned — is the dominant driver of tree cover loss in Africa and a major driver in South America.
Explore the drivers of tree cover loss for all countries and regions →
August 21, 2024
How common is homelessness across the world?
Countries have very different rates of homelessness, according to the OECD’s Affordable Housing Database.
The chart shows that more than 300 out of every 100,000 are reported homeless in France, while it’s fewer than 20 in Finland.
In about half of the countries, more than 100 in every 100,000 people are homeless. That means more than one per thousand people.
There are also differences in types of homelessness. The United States, for example, has relatively high numbers of people living in the streets or public spaces but fewer in temporary accommodations or shelters.
Not all countries on the chart can be directly compared. For example, Japan and Greece only report data on one type of homelessness, so they don’t give a complete picture of the total population affected by homelessness.
Explore our updated and expanded topic page on homelessness →
August 20, 2024
August 2024 has seen a surge in wildfires worldwide, mainly in Africa
The chart shows the weekly area burned by wildfires globally and in Africa from 2012 to 2024. This August saw an abrupt increase in the area burned by wildfires, with most of this rise coming in a single week.
This global weekly burn rate was 64% higher than any previous week during this period. This data comes from the Global Wildfire Information System.
This dramatic rise was mostly driven by severe wildfires in Africa, where approximately 22 million hectares burned in a week, accounting for around 80% of the global burned area.
Two countries have been particularly hard-hit — Angola and the Democratic Republic of Congo — where 6% and 2.5% of the total land area have burned in just one week.
August 19, 2024
Many people alive today still recall when smallpox was common
Smallpox was a deadly disease that has been recorded since ancient times. It killed around 30% of those who developed the disease.
In 1980, it became the first disease to be eradicated worldwide. This considerable achievement resulted from centuries of coordinated effort and scientific development.
People were able to fight the virus by developing and refining smallpox vaccines, using quarantine control measures, and applying ring vaccination.
Many countries — in Europe, the former Soviet Union, and many island nations — eliminated smallpox around a century ago. This is shown on the map, whose data was compiled by researchers Frank Fenner and colleagues in 1988.
Smallpox continued to kill in many countries in South Asia, Africa, and South America until the 1970s. It remains a vivid memory for many older people alive today.
Read more about the history of smallpox and its eradication →
August 16, 2024
Coal power has effectively died in the United Kingdom
The United Kingdom was the birthplace of coal. It has now, effectively, died there.
As shown in the chart, in the late 1980s, around two-thirds of the UK’s electricity came from coal. By the time I was born in the 1990s, this had dropped to just over half.
The use of coal has plummeted in my lifetime. It now makes up less than 2% of the UK’s electricity.
Coal was first replaced by gas but is now being pushed out by wind, solar, and biomass.
August 15, 2024
The sex gap in life expectancy has changed over time
Around the world, women tend to live longer than men.
However, the sex gap in life expectancy has changed over time, as this chart shows. The data comes from combining the WHO’s Human Mortality Database and the United Nations World Population Prospects.
As you can see, the sex gap in life expectancy — defined as female life expectancy minus male life expectancy — was around 3 years in the 19th century in countries like France and Sweden. It spiked during the two World Wars, as deaths surged among young men in combat.
But it also grew gradually over the 20th century to around 7 years.
One reason for this widening gap was the rise in tobacco smoking, especially among men. Smoking increases the risk of various cancers and heart disease and leads to premature death.
Since then, as smoking has declined, the sex gap in life expectancy has narrowed in many countries.
August 14, 2024
Many countries have abandoned efforts to obtain nuclear weapons
The number of countries that possess nuclear weapons has never been higher. Only one country that had them — South Africa — entirely dismantled its arsenal.
But, as the chart shows, many more states had considered or pursued nuclear weapons in the past — they are displayed in yellow and orange.
In the late 1970s, more than a dozen countries considered them or pursued them by launching nuclear weapons programs, but almost all stopped. Only Syria has considered nuclear weapons recently, and only Iran has pursued building them.
This data is based on the work of political scientist Philipp Bleek and the Nuclear Threat Initiative.
Find out which countries gave up obtaining nuclear weapons →
August 13, 2024
Cereal yields have increased in all regions, but Africa lags behind
Improved crop yields have allowed us to feed billions more people while sparing forests and other land from agriculture.
Global cereal yields have tripled since 1961. And as you can see in the chart, they have increased in all regions.
However, yields across most African countries have lagged behind. At 1.7 tonnes per hectare, they’re still less than half the global average of 4.2 tonnes.
This is bad for farmers: they get much smaller harvests and live on much lower incomes. It makes it harder for countries to feed their populations. And it’s a problem for biodiversity: lower yields mean that farmland has to expand into wild habitats.
Increasing agricultural productivity — particularly across Africa — is one of the biggest challenges of this century.
August 12, 2024
The day a child is born is the most dangerous day of their life
The world has made progress against the tragedy of infant mortality. But infants remain at risk, especially after birth.
The experience of a baby leaving the womb and entering the world is a sudden change, and birth complications, suffocation, trauma, and sepsis can be fatal.
The chart shows the risks over the first year of life. It uses national data from the United States Centers for Disease Control and Prevention to show the daily death rate (on the vertical axis), plotted against the baby’s age in days (on the horizontal axis).
As you can see, the first day of life is the riskiest. Risks then decline sharply in the days following birth and continue to decline gradually over the rest of the year. This pattern is seen across countries.
Read more about how mortality risks change over our lifetimes →
August 09, 2024
The form and extent of government support for early childcare varies a lot between countries
Data from the World Bank shows that paid leave for early childcare varies a lot around the world.
The chart shows several key differences. In some countries, like India, only mothers get paid leave. In France, fathers also get paid leave. Parents in Russia can partially share the leave.
There are also differences in the purpose of the leave. In countries like South Africa, it’s for childbirth. In others, like the United States, it’s for childcare in the months after birth. In countries like China, paid leave covers both childbirth and early childcare.
The length of paid leave differs immensely, too. In Egypt, for example, only 90 days are available, while in Japan, parents have a combined total of 800 days.
What’s not shown in the chart is how much money parents receive. This also varies a lot between countries.
These differences in government support affect young families’ finances, how childcare is shared, and how much time newborns spend with their parents.
August 08, 2024
The world gets more seafood from aquaculture than wild catch
There are two ways to produce seafood: catch fish in the wild or farm your own. Seafood farming is often called “aquaculture”. Aquaculture is dominated by the farming of fish, but also includes other organisms, such as crustaceans and aquatic plants.
Aquaculture has grown rapidly over the last few decades. In fact, as the chart shows, it has overtaken wild catch since 2013.
This has relieved some pressure on wild fish stocks: if this increased demand for fish had been satisfied by wild catch, then many more would be severely overexploited.
August 07, 2024
In rich countries, women have become a much bigger part of the workforce over the past 50 years
The chart shows that in wealthy countries, many more women are now in the workforce compared to 50 years ago.
Data from the OECD and researcher Clarence Long shows that in the late 1960s and 1970s, only 25% to 40% of women were economically active.
This number has increased to more than 50% in all countries shown. In Spain, for example, the share of women in the workforce more than doubled, going from about one in four to more than half.
Even with these increases, women’s participation in the workforce is still significantly lower than men's. However, women devote more time to unpaid work than men.
August 06, 2024
Death rates from outdoor air pollution tend to be highest across middle-income countries
Outdoor air pollution is a significant health issue that impacts well-being and mortality.
It can increase the risk of several leading causes of death, including stroke, heart disease, lung cancer, and respiratory diseases like asthma.
This chart shows that death rates from outdoor air pollution vary widely across countries. These rates, measured as the number of premature deaths per 100,000 people, are based on data from the IHME's Global Burden of Disease study.
Outdoor air pollution tends to worsen as countries transition from low to middle-income status and industrialize. This is often due to increased energy and industrial emissions without adequate regulation and cleaner technologies.
However, as countries reach higher income levels, death rates decline again as air quality improves.
Explore outdoor air pollution death rates for all countries →
August 05, 2024
Death rates have declined across all ages
Infants, children, adults, and the elderly are all less likely to die than in the past.
The chart shows death rates by age in France since the early 19th century, combining data from the Human Mortality Database and the United Nations World Population Prospects. Death rates have fallen in every age group.
When data collection began in 1816, around 1 in 5 babies in France died during infancy. Two centuries later, that figure was 1 in 274, a 50-fold reduction.
In 1816, around 1 in 20 people aged 65, died. In 2021, it was 1 in 106, a five-fold reduction.
These reductions mean that death continues to be delayed, and life expectancy continues to rise.
August 02, 2024
Tuberculosis in Ethiopia: a drastic decline but still far behind wealthier nations
In 1980, Ethiopia had the highest death rate from tuberculosis in the world. Almost 400 people died per 100,000 people, according to data from the latest edition of the Global Burden of Disease study.
Since then, the country has achieved a sixfold reduction in the death rate. This steep decline is shown in the chart.
The nation's widespread health initiatives have likely significantly improved access to tuberculosis care and treatment. These efforts have significantly exceeded the progress of other countries with similar tuberculosis rates in the 1980s.
Despite these advances, Ethiopia's tuberculosis mortality rate remains significantly above that of wealthier nations, where fewer than 1 in 100,000 people die from the disease annually.
August 01, 2024
In 2022, the sum of imports and exports across countries amounted to 63% of global GDP
According to the latest trade statistics from the World Bank’s World Development Indicators, the sum of exports and imports across countries amounted to 63% of global GDP in 2022, the most recent year available.
This metric, also known as the trade openness index, represents the ratio of total trade (exports plus imports) to global output. The higher this ratio, the greater the influence of international trade transactions on global economic activity.
The chart shows the trade openness trend since 1970. After a decade of ups and downs, with a noticeable dip in 2020, trade rebounded above pre-pandemic levels in 2022.
In fact, from a long-run perspective, the 63% observed in 2022 was historically unprecedented.
Economic historians estimate that in 1912, at the peak of the “first wave of globalization”, the trade openness index reached 30%. Global trade declined substantially during the First and Second World Wars, then increased again with the onset of the “second wave of globalization”, exceeding 50% of GDP at the beginning of the 21st century.
The fact that global trade openness was higher in 2022 than ever before may seem surprising, given that several countries that followed different trajectories received considerable attention in the media. For example, imports and exports peaked at 65% of GDP in China in 2006 but have since declined to 38% in 2022.
Read more about the first and second waves of globalization →
July 31, 2024
Every day of infancy is safer than in the past
This chart shows death rates across the first year of a baby’s life and how they have been reduced over time.
The data spans 1921 to 2021 and comes from the Office for National Statistics in England & Wales.
On the left-hand side of the chart, you can see that death rates are much higher on the first day of life. They then drop sharply over the following days and continue declining gradually over the rest of the year.
But you can also see that over decades, the entire curve has shifted downwards. This means that every day of infancy is safer than in the past.