

Heavy Smoke Blankets Borneo

Heavy Smoke Blankets Borneo
Heavy Smoke Blankets Borneo


Fires are a common occurrence in Borneo in September and October because farmers engage in “slash and burn agriculture,” a technique that involves frequent burning of rainforest to clear the way for crops or grazing animals. In southern Borneo, the intent is often to make room for new plantings of oil palm and acacia pulp.

Many of the fires burned in areas with soils underlain with peat—a soil-like mixture of partly decayed plant material formed in wetlands. Peat fires tend to be difficult to extinguish, often smoldering under the surface for months.

In comparison to other types of fires, peat fires release unusually large amounts of certain pollutants. For instance, peat fires release three times as much carbon monoxide and ten times as much methane as savanna fires, according to emission factors used by Vrije Universiteit Amsterdam scientist Guido van der Werf to quantify the amount of pollution released by the fires. According to Van der Werf, the fires in Indonesia have emitted an estimated 1.6 billion tons of carbon dioxide equivalents so far this year. That is more than the average annual emissions of Japan.

MODIS sensors on the Terra and Aqua satellites have detected fires burning in southern Sumatra since early September. The 2015 burning season has proven to be one of the most severe Indonesia has faced in the last two decades.

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