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It is perhaps surprising that biomass stoves contribute to global warming even when the biomass is harvested as a renewable resource and carbon dioxide emissions from the combustion process are offset by the absorption of carbon dioxide during re-growth . Climate change refers to long-term changes in global weather patterns resulting from changes in the composition of the atmosphere brought about by emissions of greenhouse gases ( GHG ) . In 1862 Garibaldi attempted to use a volunteer army , supposedly raised for an attack on the Balkan Habsburg territories , to seize the remaining papal states . Thus , although biomass fuel used on traditional stoves can sometimes be carbon neutral , the process is not greenhouse gas ( GHG ) neutral unless the biomass fuel is burnt efficiently and completely . In 1870 , after the collapse of Napoleon III 's empire ( an event which facilitated the final phase of nineteenth-century Italian unification , the annexation of the French-defended Papal States ) , Garibaldi led a contingent of Italian volunteers in defence of the newly declared French third republic , scoring successes against the invading Prussians at Chatillon , Autun and Dijon .