Interview. Damage to land feeds migration and conflict: U.N. official

Vast swathes of land, from Africa to the Middle East, are being left useless by climate shifts and human pressures such as deforestation, mining and farming, threatening to hike migration and conflict. The accelerating damage could cost the global economy a staggering $23 trillion by 2050 - and rich countries as well as poor will pay the price.

Interview with Ibrahim Thiaw