FAO marked UN's International Day of Forests on Tuesday by calling for a greener wood energy sector which holds a vast potential for reducing global greenhouse gas emissions and improving rural livelihoods. Up to 7 percent of global greenhouse gas emissions caused by humans come from the production and use of fuelwood and charcoal. This happens largely due to unsustainable forest management and inefficient charcoal manufacture and fuelwood combustion, according to a new FAO report published on Tuesday.