Yes. Global deforestation is one of the largest single sources of carbon emissions and eclipses that of the entire transport sector (cars, aeroplanes, shipping, trains etc).
However, where timber is harvested for fuel, and felled trees are replaced (for example, under sustainable forestry management), the net emissions are reduced. This is because the CO2 released is effectively reabsorbed by the trees planted in replacement.
Sustainable wood fuel use thus recycles currently circulating carbon. By contrast, burning fossil fuel releases carbon that has been locked up and out of the system for millions of years, so adding to the overall level of atmospheric carbon.
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