Mongabay: Fires set by developers in Sumatra are causing a choking haze to spread across the island and over to Malaysia, reducing visibility and raising health concerns, reports Reuters. NASA fire hotspot data shows dozens of fires currently burning across Sumatra and Peninsular Malaysia. More than 2,600 fire hotspots in Sumatra’s Riau province alone so far this year. Though open burning is illegal in Indonesia and Malaysia, fire is widely used by plantation managers and farmers to …