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Recent research by forest scientists at the Bogor, West Java-based Center for International Forestry Research (CIFOR) found that the main cause of haze in Riau came from dry and deforested peatland, and not just from the slashing-and-burning of forested areas, as commonly thought. The research found that peat swamps in their natural state are resistant to fire because they are wet underground, but they can be highly flammable when they dry out and are degraded.