Sikring af en fremtid med minimal udledning af CO2 vil kræve en lang række transformationer. Hvordan sådanne transformationer forestilles, indrammes og styres herunder det meget grundlæggende spørgsmål om, hvad beslutningsgrundlaget er for at imødegå de nuværende klimaforandringer. Denne afhandling fokuserer på institutionernes rolle i multi-level, multi-actor og multi-factor –”governance” af klimakompatibel udvikling. Den sigter mod at forbedre vores forståelse af potentielle transformationskilder ved at spørge, hvordan bæredygtighedens ideer styrer imod et samfund med minimal udledning af CO2. Afhandlingen undersøger af politiske problemer, indholdet af politiske forslag og den politiske dagsorden for de nuværende politikker og reformkravene omkring begrænsning af klimaforandringer. Spørgsmålet er rettet ud fra en kombination af perspektiver fra styringsteori og konstruktivistisk institutionel tilgang. Empirisk er denne afhandling baseret på fire separate casestudier præsenteret i individuelle artikler. En kortlægning af frivillige CO2-offset projekter i regionen syd for Sahara og deres konceptualiseringer af bæredygtighed for at fremhæve ideerne bag de kommercielle løsninger til begrænsning af klimaændringerne er undersøgt. Ved at undersøge grønne vækststrategier i Vietnam blev det påvist, hvordan den nuværende institutionelle kontekst er linket til programmatiske ideer om, hvordan man opnår langsigtet transformation. I tilfælde af etableringen af baseline til udvikling af nationale klima projekter (NAMA'er) i byggesektoren i Vietnam blev spørgsmålet om international videnspraksis rolle i udvikling af nationale love undersøgt. Endelig præsenteres udviklingen af elektricitetsinfrastruktur, hvordan CO2 venlige energisystemsreformer viser sig at være berettiget inden for to forskellige socio-teknologiske rammer: Mexico og Vietnam.På den ene side konstaterede resultaterne, at de over tid ved at påberåbe og appellerer til argumenter i forbindelse med neoliberalismens ideer og principper - såsom liberalisering af elektricitetssektoren, modernisering og grøn miljømæssig udvikling - begrænsning af klimaforandringer og CO2 venlig udvikling mere acceptabelt inden for sektorpolitikker. På den anden side viste analysen, hvordan politikeksperter og teknokrater bruger deres epistemiske magt og evner til at begrænse debattens omfang, hvilket begrænser omfanget af politiske reaktioner. Når der ikke er nogen grundlæggende transformationsskift i baggrunden og programmatiske ideer om udvikling, legitimerer aktører, der rammer den institutionelle kontekst inden for en rådende ramme, de konservative ideer i klimaforvaltningen yderligere. For eksempel bliver løsninger, der normaliserer nødvendigheden af fossile brændstoffer i el-produktion, samtidig med at den grønne vækst motiverer økonomisk vækst, dybere indlejret i udviklingssporerne. Konceptualisering af politiske problemer og løsninger i de fremlagte sager har resulteret i, at de etablerede aktører anvender ganske konventionelle instrumenter i den teknologiske markedsbaserede løsning i mangel af alternative og/eller mere transformative visioner om udvikling. Samlet set bidrager denne afhandling til igangværende debatter om indenrigspolitik og politikformulering af "grønne transformationer" og tilføjer udviklingslandenes kontekst. Dette arbejde hævder, at der er behov for at stimulere en kritisk refleksion overfor eksisterende klimavenlige løsninger. Den hævder ydermere, at styringsvalg, f.eks. ved udvikling af el-infrastruktur eller energieffektivitet i bygninger eller af en bredere vifte af CO2 reducerende tiltag, ikke kun skal defineres ved teknologiske løsninger. Lige så vigtigt er vedholdenheden af ideer, der bruges til at retfærdiggøre og legitimere reformer ved at mobilisere diskurser om energiforsyning og sikkerhed som en del af bredere mål for at opretholde socioøkonomisk stabilitet og forfølge strategier for udvikling af grøn vækst. Denne afhandling illustrerer, at klimavenlig udvikling ikke kun skal være teknisk, institutionelt eller økonomisk gennemførlig, men også muligt politisk at omsætte til handling. Foranstaltninger til institutionalisering af langsigtet transformation vil næppe være effektive, hvis ideerne om transformation mangler evnen til at udfolde sig inden for de parametre, som styringsregimer fastsætter. Securing a low-carbon future will require a multitude of ‘low-carbon transformations’. The issues are how such transformations are imagined and framed, along which pathways and who steers them, including the very basic question of what decisions are made to transform the present challenges to climate change governance. Understanding of the politics of these governance challenges is important in explaining which pathways are supported or delegitimised and which are ignored and fail to get off the ground. This dissertation focuses on the role of institutions and ideas in the multilevel, multi-actor and multi-factor governance of climate-compatible development. It aims to improve our understanding of potential endogenous sources of transformation by asking how ideas of sustainability influence the governance of a low-carbon society. It investigates the construction of policy problems, the content of policy proposals and the political agenda of present policies and reform imperatives around climate change mitigation and lowcarbon development. The question is addressed using a combination of perspectives, including governance theory and the constructivist institutionalapproach.Empirically, this dissertation is based on four separate case studies presented in individual articles. The study of voluntary carbon market mitigation projects in the Sub-Saharan region maps out the market actors and their conceptualisations of sustainability to highlight the ideas behind marketbased solutions to climate change mitigation. In examining national climate change mitigation and green growth strategies in Vietnam, it was demonstrated how the current institutional context relates to the background to long-term transformation and programmatic ideas about how to achieve it. In the study of baseline setting in developing Nationally Appropriate Mitigation Actions (NAMAs) in the building sector in Vietnam, the role of international knowledge practices in national policy-making was questioned. Finally, the examination of electricity infrastructure development showed how reforms to low-carbon energy systems are justified in two different sociotechnological settings: Mexico and Vietnam. On the one hand, the findings indicated that over time, by invoking and appealing to arguments associated with the ideas and principles of ix neoliberalism climate change mitigation and low-carbon development, agendas have become more acceptable in the formation of sectoral policies. On the other hand, the analysis shows how policy experts and technocrats use their epistemic power and ideational abilities to limit the scope of debate, thus constraining the range of policy responses. When there are no fundamental transformational shifts in the background and in programmatic ideas about development, the actors that frame the institutional context within a prevailing framework further legitimise conservative ideas about climate governance. For instance, solutions normalising the temporal necessity of fossil fuels in electricity generation while justifying economic growth by means of green growth arguments become more deeply embedded in development trajectories. Narrow conceptualisations of policy problems and solutions in the cases presented here have resulted in incumbent actors resorting to quite conventional instruments of technological market-based fixes in the absence of alternative and/or more transformational visions of development. Overall, this dissertation contributes to on-going debates over domestic politics and policy-making regarding ‘green transformations’ and adds to the emerging policy field in developing countries contexts. It argues that there is aneed to stimulate critical reflection on the existing assumptions regarding mitigation actions. It argues that governance choices, for example, in electricity infrastructure development or energy efficiency in buildings, or a broader range of mitigation actions, are not only defined by technological lockins. Equally important is the persistence of ideas that are used to justify and legitimise reforms by mobilising discourses on energy supply and security and framing energy transitions as part of wider goals to maintain socio-economic stability and pursue green growth development strategies. This dissertation shows that low-carbon development should not only be technically, institutionally and economically feasible, but also politically and ideationally feasible, to translate into action. Measures for institutionalising long-term transformation are unlikely to be effective if ideas about transformation cannot be developed within the parameters set by governance regimes. The key argument of this dissertation is that, for the governance of low-carbon societies, it is crucial to recognise that climate change mitigation actions are more than economic or technological challenges – they are politically charged.Paying attention to problem framings and to the diversity of multi-actor perspectives could facilitate novel responses to climate change and enable more inclusive forms of governance, as well as throwing light on the x fundamental incompatibility between and limited reach of generalised policy solutions and technological fixes.