INVERNADEROS Y CAMBIO CLIMÁTICO
HUELLA DE CARBONO NETA DE LOS INVERNADEROS ALMERIENSES
Purpose Climate change impacts in life cycle assessment (LCA) are usually assessed as the emissions of greenhouse
gases expressed with the global warming potential (GWP). However, changes in surface albedo caused by land use
change can also contribute to change the Earth’s energy budget. In this paper we present a methodology for including
in LCA the climatic impacts of land surface albedo changes, measured as CO2-eq. emissions or emission offsets.
Methods A review of studies calculating radiative forcings and CO2-equivalence of changes in surface albedo is carried
out. A methodology is proposed, and some methodological issues arising from its application are discussed. The
methodology is applied in a practical example dealing with greenhouse agriculture in Southern Spain.
Results The results of the case study show that the increase in surface albedo due to the reflective plastic cover of
greenhouses involves an important CO2-eq. emission offset, which reduces the net GWP-100 of tomato production from
303 to 168 kg CO2-eq. per ton tomato when a 50-year service time is considered for the agricultural activity. This
example shows that albedo effects can be very important in a product system when land use plays an important role,
and substantial changes in surface albedo are involved. Conclusions Although the method presented in this work
can be improved concerning the calculation of radiative forcing, it constitutes a first operative approach which can
be used to develop regionalized characterization factors and provide a more complete evaluation of impacts on the
climate change impact category.