HUAY EE KHANG, Thailand — “Do you hear the birds calling?” asks Noraeri Thungmueangthong, as the vibrant trill of a blue-throated barbet rings through the pine trees looming up ahead. “That’s a sign we’re entering the sacred forest.” Noraeri is a leader in Huay Ee Khang village, an Indigenous Pgaz K’Nyau Karen community of 125 households nestled between undulating hills in the highlands of northern Thailand’s Chiang Mai province. Within the sanctuary of the forest, she points out a wooden receptacle attached to the trunk of a tree. “When a baby is born, we place its umbilical cord in a bamboo container like this one and hang it on a young tree in this forest,” Noraeri explains. The ritual establishes a spiritual link between the child and the tree, she says. And because their souls effecti

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