Prescribed burning, fires set on purpose, is a common, if risky, method.

即是故意纵火，虽然涉及危险，却是常见的做法。

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Turns out forest fires set to clear land in Indonesia generate the kind of soot that lodges in lungs and shortens lives across Southeast Asia.

原来印度尼西亚地区放火烧林清理土地时产生的一种碳烟是可入肺的，它缩短了东南亚地区人们的寿命。

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The embassy was closed Friday, and a handful of riot police holding shields stood outside the building, its outer walls blackened from fires set the night before and some of its Windows smashed.

大使馆在周五被关闭，少数防暴警察在建筑外守卫。使馆的外墙因前夜的纵火而被烧黑，部分窗户被打碎。

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He and his crews were called in to help put out fires set by the Iraqi army as it fled from coalition forces.

VOA: special.2009.03.22

Protesters known as red shirts set more than 30 fires in Bangkok Wednesday as the military moved to close their camp in the city's center.

VOA: standard.2010.05.21

Over the following years, there were frequent break-ins and a series of fires set by squatters, neighbors said.

WSJ: Time Runs Out for Historic Harlem Row House

"Based on evidence collected since this morning and during the course of the investigation over the past five months, we are confident that Bundick and Smith are responsible for the majority of the fires set since November 12, " she said.

CNN: Virginia police arrest 2 in string of suspicious fires

Fires are deliberately set to burn off long grasses and heather to encourage new grazing for sheep and grouse.

BBC: Wildfire