Tech-equipped Indigenous firefighters protect Thai forests

In the dry-season heat of northern Thailand, Hmong villagers zip through forested slopes, blasting tinder with leaf blowers and cutting through brush with machetes, while others scan for smoke on live feeds from their phones.

Across about a dozen villages in the hills of Doi Suthep-Pui National Park, just above the city of Chiang Mai, Indigenous volunteers patrol on foot and clear firebreaks while also deploying drones and treetop cameras -- all to detect blazes early and defend Thailand's second-largest city from wildfire smoke.