rankings

Air quality is one of the most direct indicators of environmental health. This ranking shows which countries and territories breathe the cleanest air, which suffer the worst pollution, and why small islands keep beating industrial giants on the numbers.

Which countries emit the most carbon dioxide depends on how you count. This ranking uses Global Carbon Project data for 2024 and compares annual territorial emissions, per-person emissions, emissions embedded in trade, and cumulative emissions since the industrial revolution.

The ocean covers 71% of Earth's surface, and a coastal state controls the resources in the first 200 nautical miles off its shores. This ranking shows which nations hold the most maritime territory, why published figures disagree, and what an exclusive economic zone does and does not allow.

Which countries host the most active volcanoes depends on how you define active. This ranking compares the Smithsonian's Holocene counts with recent-eruption counts, and explains why the United States, Japan, Indonesia, Russia, and Chile keep swapping places.

Biodiversity is not evenly spread across the planet. Seventeen 'megadiverse' countries, most of them tropical, hold a large share of Earth's known species. This ranking uses IUCN Red List endemism data and explains why counting species country by country is so hard.

China had more than 680,000 electric buses at the end of 2024, far ahead of any other country. This ranking compares fleets, 2024 sales, and market shares across China, India, Latin America, Europe, and the United States, and explains why the numbers are hard to line up.

Forests cover 4.14 billion hectares, about 32% of the world's land, per FAO's 2025 assessment. Russia, Brazil, Canada, the United States and China hold more than half. Ranked by area and by share of land, with what the numbers miss.

Natural disasters kill thousands and affect well over a hundred million people every year. But the burden is not spread evenly. A handful of countries experience recurring, devastating disasters — and the overlap between vulnerability and poverty is striking.

Proven oil reserves are the foundation of petrostate power and the lifeblood of the global energy economy. This ranking reveals which countries hold the most oil underground — and why those reserves are simultaneously an enormous economic asset and a geopolitical liability in an era of energy transition.

A 2021 model of more than 1,000 rivers put the Philippines first, at about 36 percent of plastic carried to the sea by rivers, followed by India, Malaysia, China, and Indonesia. The ranking says as much about geography and waste systems as about consumption, and the estimates carry large uncertainty.

A handful of countries already generate essentially all of their electricity from hydro, wind, solar, geothermal and bioenergy. This ranking uses Ember's generation data, with the year for every row, and explains why most leaders are hydro countries and what that means for everyone else.

The United States has the most systems on the TOP500, but China's LineShine now holds the No. 1 spot. This ranking explains the June 2026 list, the five exascale machines, and what the count leaves out.