Green wood

Energy density charts for wood fuels tend to use air dried wood as their reference, thus oven dried or 0% moisture content can reflect 103.4% energy content.

When green wood is used as fuel in appliances it releases less heat per unit of measure (usually cords or tons) because of the heat consumed to evaporate the moisture.

[3] The lower temperatures that result can lead to more creosote being created which is later deposited in exhaust flues.

These deposits can later be ignited when sufficient heat and oxygen are present to cause a chimney fire, which can be destructive and dangerous.

Other species shrink excessively, leaving voids between the individual pieces when allowed to dry.