This document discusses Indonesia's annual forest fires and resulting haze pollution issue in Southeast Asia. It notes that forest fires commonly occur during dry seasons in Indonesian provinces like Sumatra and Kalimantan, causing major transportation, economic, health, and environmental problems domestically and across borders in countries like Singapore and Malaysia. The worst fires on record were in 1997, affecting over 200,000 people in 6 countries with severe health impacts. Drying and burning of carbon-rich peatlands also significantly contributes to global warming by releasing large amounts of greenhouse gases. Key causes of the fires include land clearing by farmers and plantation companies using the cheap slash-and-burn method.