Iceless Arctic summers now expected by 2050s
Open water will reign at top of world nine years sooner than thought, improved computer simulations suggest
![Arctic Ocean](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/ts_arctic_main_free.jpg?fit=860%2C460&ssl=1)
HOT WATER The Arctic Ocean will be ice-free almost a decade earlier than previously predicted, new calculations suggest.
Kathryn Hansen/NASA