Indonesia holds the Guinness world record for the highest annual rate of deforestation, according to Greenpeace, at 4.4 million acres per year between 2000 and 2005, or 20 square miles per day.
"Often it's illegal," said Long of the clear-cutting that results in tiger habitat loss. "And even if it's not illegal, it's certainly environmentally irresponsible."
Home to the world's third largest area of tropical forest after Brazil and the Congo Basin, Indonesia's forests are important environmentally and economically.
"It's a way to make money for the country," said Long of Indonesia's natural resources, "and within reason I don't think anyone's saying there shouldn't be palm oil plantations, but they need to plan carefully and in the right places."
In the meantime, conservationists continue to trek through remote parts of Sumatra, working to reduce human-tiger conflicts and help save both sides from each other.