One Green Planet have an excellent post on the problems with palm oil and how to avoid it.
“Large areas of tropical forests and other ecosystems with high conservation values have been cleared to make room for vast monoculture oil palm plantations.”
Vice also have a very informative report on the ecological destruction that palm oil production is having on Indonesian jungles and their inhabitants:
Production of palm oil has surged as a cheap alternative to trans fats. But as demand grows, growers in Indonesia are pushing farther and farther onto rainforest land, torching the forests as they go. The mass-burning of Indonesian jungles poses a major threat to wildlife, indigenous populations, and our global climate.