Research profile: Lorren de Kock
Carbon intensity
is an important descriptor of and widely used proxy for environmental impacts
of products. Products exported from carbon-intensive economies are becoming
vulnerable to soft-trade barriers. Producers and customers thus need to know
whether production is becoming cleaner. The purpose of this study was to determine
the global warming potential of South African apples and pears (pome fruit) for
the years 2000, 2010 and 2020, and compare it to that cultivated and packaged
in other countries. The Attributional Life Cycle Assessment (LCA) methodology was
used to determine the climate change impact across the main stages of the pome
fruit life cycle namely; the farm, packhouse, controlled atmosphere store and
cold store. Retrospective LCAs were used to determine the historical
environmental impacts for the years 2000 and 2010 and a prospective LCA for the
year 2020.
The results obtained from the Intergovernmental Panel
on Climate Change (IPCC) impact assessment method indicated a decrease in the aggregated
Global Warming Potential (GWP) of pome fruit from 1.52 kg CO2eq/kg
fruit in 2000 to 1.23 kg CO2eq/kg fruit in 2010 and finally 1.02 kg
CO2eq/kg fruit in 2020 across the four life cycle stages specified. The
life cycle stage with the largest contribution to greenhouse gas (GHG)
emissions was the Controlled Atmosphere store. At the activity level, the
consumption of the national grid electricity in the fruit packaging and storage
facilities was identified as the hotspot for all years. The normalised results
for the industry show the same rate of decline during the 20-year period and correlate
to the increasing trend of eco-efficiency practices implemented within the
industry. South African pome fruit GHG emissions for the year 2000 were relatively
high compared to similar international studies on apples and pears during the
same period. The results for the years 2010 and 2020 indicate a sustained
decline in GHG emissions intensity. Improvements are due largely to more
intensive farm-stage production coupled with eco-efficiency improvements in all
four value-chain stages, with a projected decline in carbon intensity of
electricity from the national grid expected to make a significant contribution
in the coming years.
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