The Arctic could soon be ice-free in the summer. Can geoengineering help?
This summer, Arctic sea ice hit a near-record low, second only to 2012 as the biggest melt on record. By 2050, many project an ice-free summer Arctic; the Earth\u2019s white cap would be gone. We look at a bold proposal to save ice with technology \u2014 and plans to protect what\u2019s left.