Answer: Controlled burning allows the Forest Service to control the effects of fire, its location and intensity. This poses a Positive effect. To be honest, there is nothing that poses a threat to controlled fires, unless it gets too big and gets uncontrollable, which rarely happens.
Humid defines as marked by a relatively high level of water vapor in the atmosphere. Basically, bringing moisture in the air, such as the air in a rain forest or the air of a dry desert.