| 1. |
- Hansson, Anders, 1978-, et al.
(författare)
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Biochar as multi-purpose sustainable technology : experiences from projects in Tanzania
- 2021
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Ingår i: Environment, Development and Sustainability. - : Springer Nature. - 1387-585X .- 1573-2975. ; 23, s. 5182-5214
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Tidskriftsartikel (refereegranskat)abstract
- Biochar was recently included as a promising negative emissions technology (NET) in theSpecial Report on Global Warming of 1.5 °C published by the Intergovernmental Panelon Climate Change. Unlike other NETs, it can potentially be used to mitigate global climatechange while adding to local resilience in countries highly exposed and sensitive toimpacts of climate change, such as least-developed countries (LDCs). The study is as anempirical contribution to the, as of yet, underdeveloped literature on deployment of negativeemissions technologies in LDCs in general and on biochar use in developing countriesand LDCs specifically. Nine historical and existing biochar projects in Tanzania aremapped in order to analyse problems, goals and common trade-offs associated with smalltomedium-scale biochar production in LDCs. The mapping is based on a literature anddocument study, interviews with project actors, and on-site visits to biochar projects during2019. The paper gives support to the observation made in the biochar literature thatwhile biochar has many potential socio-economic and environmental benefits, combiningthem in one single project is difficult. It is concluded that implementing biochar projects inTanzania will likely involve trade-offs between the development and subsistence strategiesand needs of local communities, the motivational forces of different project participants,and the uneven regulatory capacity of the state. We end by reflecting on the use of biocharprojects to offset carbon emissions made elsewhere.
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| 2. |
- Hansson, Anders, 1978-, et al.
(författare)
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Preconditions for bioenergy with carbon capture and storage (BECCS) in sub-Saharan Africa : the case of Tanzania
- 2020
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Ingår i: Environment, Development and Sustainability. - : Springer. - 1387-585X .- 1573-2975. ; 22, s. 6851-6875
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Tidskriftsartikel (refereegranskat)abstract
- Most mitigation scenarios compatible with a likely change of holding global warming well below 2 °C rely on negative emissions technologies (NETs). According to the integrated assessment models (IAMs) used to produce mitigation scenarios for the IPCC reports, the NET with the greatest potential to achieve negative emissions is bioenergy with carbon capture and storage (BECCS). Crucial questions arise about where the enormous quantities of biomass needed according to the IAM scenarios could feasibly be produced in a sustainable manner. Africa is attractive in the context of BECCS because of large areas that could contribute biomass energy and indications of substantial underground CO2 storage capacities. However, estimates of large biomass availability in Africa are usually based on highly aggregated datasets, and only a few studies explore future challenges or barriers for BECCS in any detail. Based on previous research and literature, this paper analyses the pre-conditions for BECCS in Tanzania by studying what we argue are the applications of BECCS, or the components of the BECCS chain, that are most feasible in the country, namely (1) as applied to domestic sugarcane-based energy production (bioethanol), and (2) with Tanzania in a producer and re-growth role in an international BECCS chain, supplying biomass or biofuels for export to developed countries. The review reveals that a prerequisite for both options is either the existence of a functional market for emissions trading and selling, making negative emissions a viable commercial investment, or sustained investment through aid programmes. Also, historically, an important barrier to the development of production capacity of liquid biofuels for export purposes has been given by ethical dilemmas following in the wake of demand for land to facilitate production of biomass, such as sugarcane and jatropha. In these cases, conflicts over access to land and mismanagement have been more of a rule than an exception. Increased production volumes of solid biomass for export to operations that demand bioenergy, be it with or without a CCS component, is likely to give rise to similar conflicts. While BECCS may well play an important role in reducing emissions in countries with high capacity to act combined with existing large point sources of biogenic CO2 emissions, it seems prudent to proceed with utmost caution when implicating BECCS deployment in least developed countries, like Tanzania.The paper argues that negative BECCS-related emissions from Tanzania should not be assumed in global climate mitigation scenarios.
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| 3. |
- Healey, Peter, et al.
(författare)
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Governing Net Zero Carbon Removals to Avoid Entrenching Inequities
- 2021
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Ingår i: Frontiers in Climate. - : Frontiers Media S.A.. - 2624-9553.
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Tidskriftsartikel (refereegranskat)abstract
- Climate change embeds inequities and risks reinforcing these in policies for climate change remediation. In particular, with policies designed to achieve “net zero” carbon dioxide, offsets may be considered inequitable if seen to avoid or delay gross emission reductions; offsets to emissions through technologically mature methods of carbon dioxide removals (CDR) require natural resources at scales threatening food security; knowledge of the potential of immature CDR is largely a global north monopoly; and CDR in particular environments is ill-understood and its implications for development unexamined. The use of CDR to contribute to robust progress toward Paris climate goals requires global agreement on simultaneously reducing emissions and enhancing removals, equity in burden sharing, and an interdisciplinary effort led by individual jurisdictions and focused on the co-development of technologies and governance to create CDR portfolios matched to local needs.
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| 4. |
- Rogers, Peter, et al.
(författare)
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Socio-Economic Determinants for Biochar Deployment in the Southern Highlands of Tanzania
- 2022
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Ingår i: Energies. - Basel : MDPI. - 1996-1073. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Biochar may contribute to both agricultural productivity and atmospheric carbon dioxide removal. However, despite the many potential upsides of adding biochar to amend carbon-depleted soils in sub-Saharan Africa, deployment is largely lacking. This paper explores the socio-economic factors that can explain tendencies to avoid action. Based on a survey of 172 farming households, key informant interviews, and focus group discussions in the Mbeya and Songwe regions of Tanzania, which were targeted for a biochar aid program in 2014, several socio-economic drivers behind the continued use of biochar deployment were identified in this follow-up study. A key deployment driver was the increased crop yields, perceived to be the result of adding biochar to soils, increasing yields from 1 metric ton per hectare to 3 metric tons per hectare. Food security and family income were cited as the main reasons to engage in biochar production and use. Climate change mitigation and increased resilience were other key reasons that motivated adoption. In terms of socio-economic factors, farmers with low education and income, the majority being males aged 40–60 years, contributed to low adoption rates in the study area. Respondents often cited the alternative usage of biochar feedstocks, lack of government involvement or extension services, traditions, and farming customs as the main constraints limiting biochar deployment.
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