Europe faced catastrophic floodwaters that affected two million people earlier this month and transformed neighborhoods and urban centers into muddy rivers. At least 24 people died, and some were reported missing.

That lethal deluge, known as Storm Boris, was made twice as likely by human-induced climate change, according to a new analysis by World Weather Attribution, an international group of scientists and meteorologists who study the role of climate change in extreme weather events.

The storm dropped 7 to 20 percent more rain than a similar one would have in a preindustrial world, before humans started burning fossil fuels and releasing greenhouse gases that have increased global temperatures.

The world is heating up quickly: 2023 was the warmest year on record, and 2024 could still surpass it, according to the National Oceanic and Atmospheric Administration. In the simplest terms, warmer air holds more moisture that contributes to more intense and frequent rainfall.

More than a half-dozen countries in Europe — including Poland, the Czech Republic, Austria, Romania, Hungary, Germany and Slovakia — saw record-breaking amounts of rain between Sept. 12 and Sept 15. The slow-moving, low-pressure system dumped up to five times September’s average rainfall over those four days. The floodwaters led to power cuts and the closure of schools, factories and hospitals.

But it was only one of many flooding events that have wreaked havoc across the world in recent months.