Planet’s darkening oceans pose threat to marine life, scientists say

The oceans have grown significantly darker over two decades, endangering marine life reliant on sunlight. Satellite data reveals more than 20% of the global ocean has darkened between 2003 and 2022, harming critical photic zones where many marine species depend on light for survival. This darkening, which can extend up to 50 meters in some areas, disrupts ecosystems and reduces productivity. While some regions brighten, the overall trend is alarming, with far-reaching impacts on marine biodiversity and Earth's climate regulation. Nutrient-rich water upwellings and climate change are key drivers of this severe issue, making it a pressing global concern.