![algae-covered beach](https://landsat.gsfc.nasa.gov/wp-content/uploads/2021/05/algaecoveredsand_0.png)
Spotting Brittany’s ‘Green Tides’ from Space
‘Green tides’ of algae have wreaked havoc across the coastlines of Brittany, France, for half a century due to high levels of agricultural runoff. With efforts to reduce these underway, a new technique using over three decades of satellite images highlights the extent of the continuing problem.