India, Oct. 8 -- While on screen, Hollywood actor Leonardo DiCaprio has fought bears; in real life, he's been fighting for causes that matter. Deep in Sumatra, Indonesia, there is a rainforest unlike almost anywhere else on Earth. The Leuser Ecosystem is the only place where Sumatran tigers, rhinos, orangutans, and elephants all live together, according to a 2023 study published in Frontiers in Ecology and Evolution. The study notes that all four are critically endangered. Leonardo DiCaprio has supported efforts to save this forest.

The Leuser Ecosystem covers an area of 2.6 million hectares, which is 6.5 million acres. According to the authors, the area is one of the most significant and well-preserved rainforests in Southeast Asia. Re:...