💰Paris is investing $1.5 billion to clean up the Sen River in time for the Olympics.
🏊♂️The city plans to create 26 swimming areas along the river by 2025.
🌊Paris has already seen a 90% reduction in pollution in the Sen River.
🚱Outdated sewer systems and high levels of bacteria pose challenges to the clean-up project.
🏙️Other cities, such as Zurich and Munich, have successfully cleaned their rivers, inspired by Paris' efforts.