WOOD FROM SUSTAINABLE SOURCES AND THE MITIGATION OF GLOBAL CLIMATE CHANGE - CASE STUDY OF SOCIAL INTEREST HOUSING IN CURITIBA, PARANA, SOUTH OF BRAZIL

摘要

Global climate change is a natural phenomenon being accelerated by human actions that generate Greenhouse Gases - with GHG levels increasing, especially CO2. In order to estimate the contribution of increasing wood usage within popular homes, a comparative study was conducted, involving a 52 m2 model traditionally built by the Parana State Housing Company - COHAPAR and an alternative model from the Wood Products Laboratory of the Brazilian Forest Service - LPF/SFB. The LPF/SFB wood house model uses 62 construction items, being 56% of which wood materials, against 67 items applied at COHAPAR model with 29% steel materials. The LPF/SFB model resulted in an emissions reduction of 12,1 tCO2eq / unit just by replacing high emission's associated raw materials, it elevates demand of forest biomass in circa of 60 % and generate another 8 tCO2eq / unit for energy production with the use of solid residues. Besides those effects, the use of residues avoids methane emissions at landfills. In terms of CERs, the cumulative effect of increasing Sustainable Forest Management production or reforestation, replacing raw materials, producing energy from residues and avoiding methane emissions from landfills, result in estimated 83 tCO2eq / unit, or US$ 830 in terms of carbon credits.