Netherlands ? Indonesia’s tropical rain forests are disappearing 30 percent faster than previously estimated as illegal loggers raid national parks, threatening the long-term survival of orangutans, according to a U.N. report released Monday in The Hague.

Loggers are clearing an estimated 5.2 million acres of forest a year for timber worth $4 billion, said the U.N. Environment Program report, which was released at the triennial meeting of the 171-nation Convention on International Trade in Endangered Species.

Earlier forecasts said Indonesia’s lowland rain forests would be seriously degraded by 2032. But projections based on new satellite surveillance suggest that 98 percent of the forests will be destroyed by 2022, and many protected areas for orangutans will be gone by 2012, the report said.

Only about 7,000 Sumatran orangutans and 50,000 Borneo orangutans remain in the wild. The number of Sumatran orangutans has fallen 91 percent in the last century, based on studies of the number of apes in today’s forests, said Ian Redmond, of UNEP’s Great Apes Survival Project, which carried out the study.