Burning more than 235,000 acres so far, the Rim Fire in Yosemite has become the sixth largest wildfire in California history. 

But it was a 1988 fire, which burned nearly one third of Yellowstone National Park, that fundamentally changed our understanding of wildfire policy in America: When do we let natural wildfires burn, and for how long? How do we decide when to put them out? 

via The New York Times Retro Report