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Global warming and its impacts on the environment, the human being and the economy are one of the biggest challenges of the 21st century. With the atmospheric carbon dioxide concentration being the main driver of global warming, the necessity arises to address the issue of carbon dioxide emissions. Next to the avoidance, the reduction and the compensation of emissions, negative emissions are moving into the focus of decision-makers in politics and in the economy. These can be created using either nature-based methods or negative emission technologies. The paper “Methods for generating negative emissions: Are negative emission technologies a climatically and economically viable alternative to nature-based methods?” aims to answer the research questions whether negative emission technologies are a more effective instrument to create negative emissions than nature-based methods and, under which circumstances an investment in these technologies is reasonable for a company.
The method used to answer the questions is a literature research to perform a comparison of two examples. The afforestation project Bonn Challenge serves as example for a nature-based method to create negative emissions while the Direct-Air-Capture plant “Orca” by the company climeworks AG is used as an example for a negative emission technology. A benefit analysis is conducted to assess the effect on carbon dioxide concentration and a net present value calculation is carried out to enable an investment decision under different scenarios.
The paper finds that Direct Air Capture is a more effective way to reduce the atmospheric carbon dioxide than the afforestation. The crucial advantage of the technology is the permanent storage of the removed carbon dioxide and the immediate carbon dioxide effect. Furthermore, the results of the net present value calculation imply that in the short-term an investment in negative emissions is not economical. In the long run, rising prices for emission certificates and the possibility to sell removed and stored carbon dioxide or to offer carbon dioxide removal as a service can make an investment in negative emission technologies like Direct Air Capture reasonable. A condition for that is that the cost of carbon dioxide removal with Direct Air Capture is reduced to 100 $/tCO2 between 2026 and 2031 depending on the applied interest rate.
Based on the found results, the paper suggests that from a climate protection perspective, negative emission technologies should not be seen as alternatives to nature-based methods but that different approaches to create negative emissions must be combined to meet climate targets. The paper also proposes that prices for emission certificates in the EU-ETS should be increased as soon as possible in order to promote an investment in negative emission technologies. Also, further research using more detailed data and covering more aspects is recommended.
Over many decades, greenhouse gas emissions caused by human activity have been increasing and negatively impacting the environment and promoting climate change. One sector that contributes heavily to these emissions is the food industry.
With the aim of reducing these environmental impacts, climate labeling has been introduced as one possible approach to target emissions related to consumer purchasing behavior. This thesis investigates consumer responses to the possible introduction of climate labeling of food products. Moreover, necessary criteria for such an implementation and the potential consequences in terms of increasing sustainability in the food industry are evaluated.
Findings indicate that a label can be effective and change consumer behavior if food labels meet specific label criteria such as an attractive design and little but comprehensible information. Moreover, other factors such as pricing of products can influence the success of food labels.
Regarding the overall food industry, a label could have positive effects but is dependent on changes on both consumer and producer sides following the label introduction. However, it is difficult to exactly evaluate the impact of a label on an entire industry, as green-house gas reductions caused by a label would be hard to measure specifically. Due to the lack of data, it is impossible to predict the actual impact of a climate label on the food industry, but it is possible to assume a positive tendency towards more sustainability.