Agriculture has a big influence on the environment, it contributes to climate change and global warming. With the use of fertilizers, pesticides, soil, land, water, and energy it’s responsible for approximately 20% of all greenhouse gas emissions. And wine production is no exception, the process of growing grapes and transforming it into wine, contributes to those effects as well.
With the method called life cycle assessment (LCA), the environmental impact of different products life cycle can be assessed and compared. In this article, we are presenting some highlights of wine LCAs.
Life cycle assessment (LCA) is a method to assess environmental impacts of a product life cycle from cradle to grave, namely from raw material extraction through manufacture, and use to the very end – either disposal or recycling.
LCA method was made to analysis industrial production system impact on the environment, but in recent years it has also been used to assess the environmental impact of agricultural products.
Consumption of energy in all stages of the product life cycle, in addition to some other processes, contributes to greenhouse gas emissions.
Greenhouse gas (GHG) emission are emissions of various gasses, such as carbon dioxide, methane, nitrous oxide, fluorinated gasses, which have a negative impact on the climate. Due to the simplified understanding greenhouse gas emissions are converted to CO2 equivalents.
And this is how we get to the term “Carbon footprint”, which is defined as “the total set of greenhouse gas emissions caused by an individual, event, organization, product expressed as CO2e.”
To determine the environmental footprint of an agricultural product, the analysis of individual product life cycle has to be addressed. The life cycle of wine production is divided into the next stages: production, transport, storage, processing and the end of the product life cycle – consumption. The detailed process of grape cultivation and winemaking is presented in figure 1. together with the environmental indicators of wine production.
The life cycle of wine is organized into four main stages:
(1) cultivation – vineyard,
(2) vinification – winery,
(3) bottling – packaging, and
Most of the studies find that there are two main phases in wine production which produce the most CO2e emissions – the production of glass bottles in the phase of wine bottling and fuel production and combustion (use of machinery) in the vineyard, especially in the vine planting phase. The detailed impacts for the carbon footprint in each stage of the production (for a packaged wine, from California) is shown in figure 2.
Studies that compared the life cycle assessment according to different agricultural techniques used in the wine sector – conventional, integrated and organic came to rather interesting conclusions.
In view of the LCA, the organic system shows the worst environmental performance. This result seems a little odd since organic production is known as environmentally friendly.
According to the literature, the conventional system is supposed to have the highest negative impact on the environment. Mainly due to the use of mineral fertilizers and herbicides, as well as the more repeated use of pesticides in comparison with other systems. In organic system, mineral fertilization and herbicides uses are forbidden, while plant protection products usage is very limited. Compared with the integrated production, the use of plant protection products in organic system is lower by 20-50%. However, more frequent use of tractors in organic production results in higher greenhouse gas emission and higher energy consumption. Also, lower yields in organic production contributes to the highest amount of CO2e on a tone of a crop – grapes.
The best results in the view of LCA shows integrated system, while conventional is somewhere in between.
When comparing emissions of CO2e/t crop among the different size of the wineries (small, medium, large), emissions are declining with the size of a farm. The bigger the farm, the lower the emission. Emissions from small farm increased due to the use of the tractor aggregates with less power, which is less energy efficient compared to the tractor aggregates of greater power; moreover, there is more lineal in mechanical tasks on a small workspaces.
Why the need for LCA?
LCA allows identifying the differences in environmental impact between different systems. It also shows the overwhelming importance of the manufacturing steps of materials (tractors, tools, etc.) and inputs (fuel, pesticides, fertilizers) in wine production, as well as any other agricultural production.
Wine-growers might wonder why is it important for them to know the CO2e level they produce in the winery. For start being an environmentally friendly winery is a big plus in promoting and selling wines. And on the other hand knowing winery bottlenecks allows production optimization – reduces the consumption of energy, water, pesticides and save money.
Most wineries have room for improvements in:
- packaging, in particular production of glasses bottles,
- vineyard field emission – use of nitrogen fertilizer and use of machinery
- distribution of wine, i.e. transportation, and
- electricity usage
What is a carbon footprint?; Carbon trust
California Wine’s Carbon footprint, CSWA,2011
The environmental impact of a Sardinian wine by partial Life Cycle Assessment, Graziella Benedetto, 2013
ENVIRONMENTAL FACTSHEET: Wine, European Commission, 2015
Okoljski odtis kmetijstva in živilsko predelovalne industrije ter tehnološki ukrepi za njegovo znižanje v prihodnosti, dr. Viktor Jejčič, 2014
Defining Life Cycle Assessment (LCA); US Environmental Protection Agencc, 2010