I recently encountered employees of the Pennsylvania Game Commission and the Department of Conservation & Natural Resources conducting prescribed burns on a local Game Lands.
Fire is a valuable tool in the tool box of wildlife habitat professionals. Its use quickly reduces the available fuel load, greatly reducing the threat of wild fires. When burning dry grasses such as this the fire becomes very hot extremely quickly and only burns for a few minutes. In its aftermath a fine ash covers the ground, a layer of fertilizer which will soon encourage lush new growth.
It was very evident from watching this crew work that they are professionals who understand the nature of fire as they controlled it so well that at no time was there even a remote chance of it spreading beyond the intended area.