Palm trees cover everywhere
The trees originally came from west and south-west Africa, but they were introduced to Indonesia and Malaysia in the late 19th and early 20th centuries.
Palm oil production is said to have been responsible for about 8% of the world's deforestation between 1990 and 2008.
This is because forests are burned to clear areas where people can grow oil palms - even if it's illegal.
Burning forests like this destroys the places where plants and wildlife live, meaning the area has less biodiversity.
