“It’s 5 a.m. and still dark at the Carlton Complex fire camp in central Washington, except for the fire’s orange glow on a distant ridgeline. Wildlands firefighter Bre Orcasitas, two colleagues, and three volunteers suit up: heavy duty fire-resistant pants, shirt, jacket, and helmet. Their boots weigh 2 kilograms; the backpacks they will haul to the fire—loaded with 6 liters of water, food for a 16-hour shift, safety gear, and hand tools—can weigh 30 kilograms. Sometimes the burden includes a 12-kilogram chain saw.