South East Asia haze: What is slash-and-burn?

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A patch of land being cleared by burning in Indonesia
Image caption,
There has been concern over the extent of land clearance for palm oil plantations in Indonesia

Singapore and parts of Malaysia and Indonesia have been shrouded in a dense, pungent smog in recent days caused by fires in Indonesia.

Pollution levels have hit record highs and while the blame game goes on, the one common factor has been the term "slash-and-burn".

Image caption,
The growing demand for palm oil has made the crop a lucrative farming option
Media caption,

The BBC's David Shukman explains the impact and cause of the haze