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Browsing by Subject "hiilijalanjälki"

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  • Aarrelahti, Emmi (2023)
    Achieving the global 1,5 degrees Celsius climate target requires the contributions of several societal actors to reduce emissions. Several actors have started to work to untangle the emissions of their operations and abate them. The Turku and Kaarina parish union, which operates in Southwest Finland, has also set a personal goal to reduce its emissions, aiming to be a carbon-neutral organization by 2029. The purpose of this thesis is to find out the carbon footprint and the forests’ carbon sinks of Turku and Kaarina parish union and make the carbon neutrality roadmap with some examples of how to achieve the parish union’s carbon neutrality goal of 2029. In addition, the thesis examines through the selected case study the organization’s methodology of the carbon footprint and the realization of the carbon neutrality goals. Both the parish union’s carbon footprint and the forests’ carbon sinks are calculated for the year 2022. The materials of carbon footprint consist of the activity data of the parish union and the emission factors. The calculation of the carbon footprint is carried out based on the international standards, Greenhouse Gas Protocol, and ISO 14046. The forests’ carbon sinks are calculated based on the parish union’s information on its forestry management of 2022 and the research of Natural Resources Institute Finland about the carbon sinks and stocks of local parishes of the Evangelical Lutheran Church of Finland of 2021. The estimate of gross emissions of Turku and Kaarina parish union for 2022 is approximately 4985 tCO2e. The biggest emission groups are procurements, real estate, and travel. The size of the forests’ carbon sinks is approximately 1176 tCO2e, offsetting about 24–29 % of the gross emissions depending on the parish union’s carbon neutrality targets. Based on the union’s carbon neutrality goal, the net emissions should still be reduced by about 2261 tCO2e and offset by about 551 tCO2e. The realization of Turku and Kaarina parish union’s carbon neutrality goal would require significant emission reductions, especially from the biggest emission groups. Because the union has already executed a major portion of the easiest emission reductions of the union’s operations, the realization of new and large emission reductions is challenging to implement only in six or seven years. In addition, the realization of the carbon neutrality goal is hampered for instance the different limitations and uncertainties related to the carbon footprint calculation, stability of forests’ carbon sinks, and the practical implementation of the roadmap. However, the carbon neutrality goal of the Turku and Kaarina parish union will be progressing particularly with the successfully implemented sustainability transformation and transition and the Church’s environment diploma, supporting the Church’s environmental education, and promoting wide-scale societal transformation towards the climate-neutral life.
  • Jaakola, Suvi (2020)
    Plastics are important materials in construction due to their longevity, durability and lightness. However, the use of plastics should be reduced as they are made mainly from fossil fuels and unnecessarily end up in the environment where they cause damage to various organisms. The purpose of this Master's thesis was to investigate whether the plastics currently used in infrastructure construction can be replaced by better choices in terms of recyclability and carbon footprint. The subject of the thesis was two infrastructure construction sites in the city of Helsinki, where it was studied how much and what types of plastics were purchased for the site, excluding packaging plastics. Thereafter, circular economy experts and waste management companies as well as pipe manufacturers were interviewed to clarify how well polyvinylchloride (PVC) and high density polyethylene (HDPE) plastic materials can currently be recycled. In addition, it was investigated whether nowadays used cable protection pipes could be replaced by recycled plastic pipes or biobased plastic pipes. Plastics that were used at the construction sites were PVC, HDPE, polystyrene (XPS), polypropylene (PP), cross-linked polyethylene (XLPE) and ethylene-propylene rubber (EPDM). There is no further processing of recycled PVC into the recycled plastic granulates in Finland, which is why PVC plastic is sold abroad. In addition, due to the chlorine content of PVC, incineration is not recommended for PVC products. For this reason, it would be good to replace PVC plastic in cable protection pipes with HDPE plastic. HDPE plastic can be recycled in Finland, and further processed into recycled plastic granulates, which can be used for pipe production instead of virgin material. There are no bio-based pipes yet in Finland, which is why waste management companies do not have experience in recycling bio-based pipes. Based on the literature review, no clear differences were found in the carbon dioxide emissions of HDPE and PVC plastic manufacturing. However, HDPE and PVC pipes made from recycled plastics were clearly lower in emissions than similar virgin plastic pipes. At the moment, within the framework of for recyclability and carbon footprint, the best option would be an HDPE cable protection pipes made of recycled plastic, as the use of recycled plastic itself reduces the carbon footprint of the pipe.