Climate change threatens life in ocean's twilight zone.

Life in the ocean’s twilight zone, which lies between 200 metres and 1,000 metres below the surface, is expected to face dramatic declines and even extinction as seas warm and less food reaches the dimly lit waters. Up to 40% of life in the twilight waters could be gone by the end of the century, according to a study published in Nature. Recovery could take thousands of years. Warmer oceans also reduced carbon storage, leading to faster carbon release. The study offered three possible futures for the twilight zone, and significant changes may already be under way.