Climate crisis threatens life in ocean's twilight zone.

The climate crisis could reduce life in the ocean's mesopelagic zone, also known as the "twilight zone," by 20% to 40% by the end of the century, according to new research. The region, which accounts for a quarter of the ocean's volume, is home to billions of metric tons of organic matter and some of Earth's most stunning biodiversity. The study warns that if greenhouse gas emissions continue, the ocean region's life could be severely depleted within 150 years, and recovery may not be possible for thousands of years.