Guardian: As a child, Matt Aman grew up in the lush tropical lowland rain forest of Sumatra. Tigers padded through the underbrush, rarely seen and silent as shadows. “It made my skin prickle,” the indigenous leader recalled recently as he sat on the floor of a stick hut surrounded by fellow villagers. “When I was young, it was easy to find the mouse deer, monitor lizard, and wild pigs,” Aman said. The birds were majestic, too, he said, as he nodded and lit a cigarette. They filled the …