According to an article published on June 30, 2013 on Business Week, “Wilmar International Ltd. (WIL), the world’s largest palm oil trader, plans to cut ties with Indonesian suppliers that clear land with illegal fires after blazes engulfed Singapore in a record haze.
Wilmar, which bans burning on its own plantations, relies on third parties for more than 90 percent of the crude palm oil for its refineries. Sime Darby Bhd. (SIME), the biggest publicly traded palm oil producer, also prohibits burning at its own plantations and relies on other sources for supplies, buying as much as half the commodity for its plants from others.
Palm oil refiners are being pushed to enforce their no burning policies to suppliers after hundreds of illegal blazes raged last month in Indonesia, the world’s top producer of the commodity.”
You may read the article on the Business Week internet site.