More than 100,000 fires ravaged the Indonesian islands of Sumatra and Kalimantan throughout September and October 2015, producing a noxious haze that affected tens of thousands of people.

Seasonal rains began in November, but 2015/16 are El Nino years, so the threat of new fires is far from over. The problem is complex but it can be solved. Scientists from the Center for International Forestry Research (CIFOR) explain.