In the case of substitution of fuelwood for fossil fuels, the CO 2 benefits occur at the time when fossil fuel combustion is avoided.
(the CO 2 benefits; occur; T:at the time; L:In the case of substitution of fuelwood for fossil fuels) (fossil fuel combustion; is avoided; T:the time)
the CO 2 benefits fossil fuel combustion
occur is avoided
T:at the time L:In the case of substitution of fuelwood for fossil fuels
T:the time