Lung cancer kills more than two million people every year, making it the most fatal cancer globally.

While a number of factors increase the risk, the 20th century brought one like no other: smoking.

There is now plenty of epidemiological evidence linking smoking to lung cancer, but we can also see it in the patterns of death over decades. The chart shows death rates from lung, trachea, and bronchus cancers among men in a selection of high-income countries. Each shows a very clear rise and fall over the late 20th century.

This pattern mirrors smoking rates, with a lag. The timing and height of each peak depend on when and how strongly smoking took hold: early in the United Kingdom, later in Japan.

You also see this rise and fall among women, shifted later, since they took up smoking after men did.

Today, most smokers live in low- and middle-income countries, who are at different stages of this curve. Helping people quit or preventing them from starting in the first place would save many lives for decades to come.

Effective waste management systems are something that many of us living in high-income countries take for granted. Our waste is collected from bins in our street and taken to controlled or sanitary landfills, incinerators, or recycling centers.

But in many low- and middle-income countries, this is not the case.

In some of them, less than half of the waste (from households, shops, and other sources) is collected by management services at all.

In many countries, even when waste is collected, most of it — sometimes over 80% — is taken to open dumps or is openly burned. You can see this in the chart.

Both methods cause pollution, either through waste leaking from open dumps or toxic air pollution generated when plastics and other materials are burned.

While these numbers show that huge amounts of the world’s waste are mismanaged, they also tell a story of opportunity. Countries that invest in waste management can do so effectively, so that very little waste pollutes the environment, and the air is far cleaner.

Coffee is part of daily life for millions of people around the world. It’s also a key source of income and employment in many countries. In this chart, I want to focus on the shift in where it is grown over the last six decades.

The chart shows the breakdown of global green coffee bean production by region, from 1961 to 2024. Green coffee beans are those that haven’t yet been roasted.

South America has been the largest producing region throughout this period, but its share of global output has fallen, as has Africa’s. The biggest story is the growth of coffee production in Asia: it went from producing less than 5% of the world’s coffee in the early 1960s to about 32% today.

Much of Asia’s growth comes from Vietnam, where production rose from around 5,000 tonnes in the early 1980s to about 2 million tonnes today. It now produces more than all African countries combined.

This expansion was driven largely by the spread of Robusta, a hardier and higher-yielding variety than Arabica, which is the type that dominates Latin American production.

Brazil is the world’s largest producer, while Vietnam is now second. Colombia used to be in that position, but Vietnam overtook it in 1999.

The International Energy Agency (IEA) just published its latest annual Global EV Outlook. It provides estimates for electric vehicle sales in 2025.

One in four (25%) cars sold in 2025 were electric, more than double the share from just four years earlier.

But there are large differences in adoption rates across the world. This chart shows new sales shares by country. In Norway, almost every new car is an electric one. In China, more than half are, while in the United States, it’s just 10%.

These figures include fully electric vehicles and plug-in hybrids. You can find this data broken down by vehicle type in this chart.

To decarbonize road transport, the world must move away from petrol and diesel cars towards electric vehicles and other forms of low-carbon transport.

This transition has already started. In fact, global sales of combustion engine cars are well past their peak and are now falling.

As you can see in the chart, global sales peaked in 2017. This is calculated based on data from the International Energy Agency. Bloomberg New Energy Finance also estimated this peak occurred around that time.

Sales of electric cars, on the other hand, are growing quickly. They more than doubled in the three years from 2022 to 2025.

In Tajikistan, remittances — the money sent or brought back by migrants — amounted to 48% of GDP in 2024. The chart places this figure in context by comparing it with other countries with data for the same year.

Nicaragua and Honduras receive remittances worth around a quarter of their GDP — high by global standards, but still far below Tajikistan's level.

Remittances here include two types of flows: money migrants abroad send home to their families, and money cross-border workers bring home from short-term jobs abroad.

Both of these flows play a role in Tajikistan, where most remittances come from labor migrants in Russia. In addition to the roughly 400,000 Tajiks settled there, hundreds of thousands more cross the border for seasonal and short-term work.

According to a report from the International Organization for Migration, about 1.2 million Tajiks were in Russia in mid-2024, which is more than a tenth of Tajikistan's total population.

The World Bank's latest Tajikistan Economic Update says that much of the country's recent rapid economic growth (above 8% since 2021) was supported by these remittance inflows.

We’ll often see headlines quoting how many gigawatts of new solar farms or coal plants China is building. But it’s hard to get a meaningful sense of scale for how electricity generation in China is changing.

The chart puts it in perspective.

In 2025 alone, China’s electricity generation increased by almost 500 terawatt-hours (TWh). This is compared here to the total amount of electricity that whole countries generate each year.

Germany generates almost exactly that amount. That means China effectively added a Germany-sized grid to its electricity system in just one year.

What’s also quite staggering is that almost all of this new generation came from solar and wind. China generated 340 TWh more electricity from solar than the year before.

That’s more than our two home countries, the UK and Spain, generate from all sources each year.

Low-carbon sources grew so much that coal power in China actually fell slightly.

Japan closed down most of its nuclear plants after the Fukushima Daiichi disaster in 2011, and nuclear production dropped dramatically.

You can see this in the chart above, which shows Japan's electricity mix since 1985. It’s based on data from the Energy Institute.

Fossil fuel plants — notably coal and gas — were ramped up to keep the lights on. The first nuclear reactors only came back online in 2015, under stricter rules from a new safety regulator created after the disaster.

As of early 2026, 15 reactors are running — out of 54 before Fukushima — and nuclear's share of electricity is still only around a third of its pre-2011 level.

Crop yields across Africa have lagged far behind the rest of the world — the regional average is around 2.5 times lower than the global average.

But some countries in the region show that yields can grow much faster. Ghana is one example. In the chart, you can see its cereal yields compared to the average for Africa as a whole.

Several government programs contributed to this growth.

In 2008, the Ghanaian government launched a fertilizer subsidy program; it had some impact on yields but was relatively modest.

The largest shift came from the introduction of the Planting for Food and Jobs program in 2017, which dedicated large public funds to distributing improved seeds, fertilizers, and other inputs to farmers.

The data shown is based on nationally reported statistics, and some researchers question the exact size of the reported gains.

But the result that yields have gone up looks robust: independent modeled assessments estimate that maize and rice production are over 40% higher than they would have been without the program.

In the late 20th century, a handful of countries — led by Brazil and the United States — turned to liquid biofuels to reduce their dependence on foreign oil markets, producing transport fuels from cheap crops instead.

In the early 2000s, interest in biofuels ramped up sharply, and not just in the Americas. They came to be seen as a leading method to decarbonize road transport. This was because today’s alternative to the combustion engine, the electric car, was still far too expensive.

Over the last two decades, global liquid biofuel production has grown sevenfold, as the chart shows.

Electric vehicles are now far cheaper and, in some places, cost-competitive with petrol cars, so biofuels are no longer seen as the central answer to low-carbon transport.

Yet, the world produces more of them than ever, and this is expected to grow over the coming decade, largely due to fuel standards and national policies that have promoted them.

Around 1.3 million people die from road injuries across the world every year. That includes the deaths of drivers, passengers, and pedestrians.

That’s around 2.4% of deaths from all causes.

As the chart shows, this death toll has been similar for decades, in the range of 1.25 to 1.35 million deaths each year.

However, with a larger global population and many more cars on the road, this means the death rate from road injuries — the number of deaths per 100,000 people — has fallen.

Solar and wind energy have grown quickly in recent years, but global electricity demand has grown faster. So while their share of electricity generation kept rising, it wasn't enough to push fossil fuels into absolute decline.

But in 2025, that changed. According to Ember's Global Electricity Review, low-carbon electricity sources grew faster than demand, pushing some fossil fuels out of the mix.

Global electricity generation increased by around 850 terawatt-hours (TWh) from 2024 to 2025. As you can see in the chart, solar and wind accounted for nearly all of this growth. While the world still burned slightly more gas, this was more than offset by a decline in coal and oil.

To reduce carbon emissions, fossil fuel use needs to keep falling in absolute terms — not just in the power sector but also in other energy and industrial sectors.

In 2018, my colleague Max Roser wrote an article titled “The Internet’s history has just begun”. His point was that while the Internet had already changed the world, large changes lay ahead because billions of people weren’t using it yet.

In this chart, I revisit that observation using more recent data from India, the world’s most populous country.

When Max wrote his article, roughly one in five people in India were online. The chart shows that since then, adoption has grown much faster than in the decades before. Today, more than 70% of India’s population is online — close to the global average.

When you look at related trends in the adoption of communication technologies, you see that much of the sudden acceleration in growth after 2018 was driven by mobile phones.

Mobile phone subscriptions in India took off in the early 2000s and had already reached 75 per 100 people by 2015. Internet access accelerated through its mobile networks, which were made affordable by new technologies and market competition — including a major market disruption, which started in 2016 when a new low-cost entrant drove down prices.

Teenage pregnancy rates have fallen across all regions in the last few decades.

The chart shows the number of live births per 1,000 women aged 15 to 19 since 2000, based on data compiled by the United Nations.

Globally, rates have fallen by over one-third. This decline has been even more dramatic in some regions. For example, rates have fallen by over three-quarters in Central and South Asia.

Birth rates have also fallen among adolescents aged 10 to 14 years old, where health concerns for pregnancy in such young girls are even greater.

One way to measure income inequality is to look at the share of all income that goes to the top income earners. The chart plots this for all seven South American countries with comparable 2022 pre-tax income estimates in the World Inequality Database.

The difference between the left and right bars is which earners they cover: the richest 10% on the left, the richest 0.1% on the right.

Looking at the left-hand bars, Colombia ranks top. It has the highest share going to the richest 10%, followed by Chile, Brazil, and Peru — in these four countries, the top 10% share earns more than half of all income. This is high relative to other countries around the world.

But looking at the dark blue bars on the right, the rankings change. Peru’s richest 0.1% receive about 22% of income, the highest in the region by far, and actually the highest in the world that year.

This chart shows just two metrics, but you would also get different pictures if you looked at Gini coefficients or the distribution of wealth instead.

So, what is the most unequal country in South America? It depends on what metric you look at. This is a region with high inequalities, but different indicators will tell you different stories depending on which part of the distribution you examine, and how incomes are measured.

Most people in the world would think very little before flicking on the lights, charging a mobile phone or turning on a laptop to read this.

But that’s a very different reality from the almost 700 million people in the world who have no access to electricity. While this number is large, it has halved this century, falling from 1.35 billion to 675 million. You can see this in the chart.

However, this progress has been far from even. The number has fallen across all regions except Sub-Saharan Africa, where it has increased.

That doesn’t mean no progress has been made: the share of people in Sub-Saharan Africa with electricity has doubled, rising from 26% to 53%. But population growth has outpaced this expansion, meaning the number of people without electricity has still risen.

Fertility rates — which measure the average number of children per woman — have been falling worldwide. Since 1950, global fertility rates have halved, from almost 5 children per woman to 2.2.

As a result, global population growth has slowed dramatically, and many countries' populations are expected to decline by the end of the century.

This is because fertility rates in many countries have fallen below the “replacement level”. This is the level at which a population replaces itself from one generation to the next. It’s generally defined as a rate of 2.1 children per woman.

The map shows which countries had fertility rates above and below this level in 2025. This is based on projections from the UN World Population Prospects.

Most of the world's poorest people still rely on solid fuels — such as crop waste, dung, wood, and charcoal — for cooking and heating.

These fuels generate household air pollution when they’re burned. This has health impacts for those who breathe them in, and can increase the risk of a range of illnesses, including cardiovascular disease, stroke and some cancers.

Estimates from the Institute for Health Metrics and Evaluation suggest that indoor air pollution causes almost three million premature deaths each year. That’s three million people dying earlier than they otherwise would without this pollution.

As shown on the chart, deaths from indoor pollution have fallen as more people get access to cleaner cooking fuels. Improving access to clean energy could prevent many more early deaths.

Cervical cancer death rates among women in the United Kingdom have fallen by around 80% since 1950. You can see this reduction in the chart.

This progress happened for a couple of key reasons.

The first was the introduction of population-level screening programs in 1988. Across the UK, women are invited to get a regular smear test to detect precancerous changes or cervical cancer cases early, when treatment has much better odds of success.

Another, and more recent innovation, which could put the UK on the path to eradicating cervical cancer completely, is the rollout of the human papillomavirus (HPV) vaccine. This protects someone from the HPV infection, which can later develop into cervical cancer.

In schools across the country, girls in their early teens are offered the HPV vaccine, effectively offering them long-lasting protection. I was one of the first cohorts of girls in the UK to receive this, and it’s something I’m incredibly grateful for.

The UK is not alone in its progress: a number of countries have managed to reduce cervical cancer death rates in recent decades.

France generates two-thirds of its electricity from nuclear power, making it the country’s dominant power source.

As the chart shows, that’s far more than the average across Europe, which is 20%, and the world as a whole, at 9%.

Nuclear power is a low-carbon electricity source, giving France a very clean electricity mix for decades.

Per unit of electricity, France emits far less greenhouse gas than its neighbors and has some of the lowest-carbon power in the world. The global average, based on lifecycle emissions, is 472 grams of carbon dioxide equivalents (CO₂e) per kilowatt-hour of electricity generated. In France, this figure is 42 grams.