Pollution is the main driver of climate change, and the main issue facing humanity.
Air pollution leads to seven million deaths per year, according to the World Health Organisation (WHO).
Unsafe water sources cause another 1.2 million deaths annually, according to Our World in Data.
And excessive light pollution can disrupt ecosystems, cause animal deaths, and lead to more stress, anxiety, fatigue, and even cancer in humans.
If you'd like to learn more about how we reached our conclusions, check out our methodology below.
The full rankings are also lower down, but for now, let's see the top 10.
