This scene of devastation is part of the Forest Service’s pivot towards embracing glyphosate in its efforts to reforest in the wake of massive wildfires. The agency’s herbicide use in the Tahoe area is mirrored by another fire-restoration plan in Northern California’s Lassen National Forest, where the Forest Servie plans to spray about 10,000 acres with Roundup or a similar product.

As our investigation revealed, the deployment of glyphosate in California’s forestlands has been growing for decades, driven in part by the worsening fires, as companies and government officials scramble to harvest burned wood and replant trees for future timber sales. Glyphosate is among the effective methods—and the Forest Service says the cheapest—to get pine trees to grow back faster, as it kills any other plant that might compete for sunlight, soil nutrients, and water.