Like many other plants, some palms are in danger of dying out because of human activity. The greatest dangers are from Increasingly large cities, mining, and turning forests into farmland. The harvesting of the heart of a palm for food also poses a threat, because it comes from the inner core of the tree, and harvesting it kills the tree. The use of rattan palms in furniture has caused a big fall in the number of rattan palms, as they are collected from the wild instead of being farmed. The sale of wild seeds to growers and collectors is another threat.