Building smart cities, the just way. A critical review of “smart” and “just” initiatives in Bristol, UK

This article investigates the application of the “smart cities” and “urban climate justice” concepts to two urban initiatives based in Bristol, UK. Both ideas are increasingly popular in academic literature. Yet, little is known about their understanding by the practitioners such as policymakers, third sector organisations and citizens. Two case studies, a community-based energy efficiency initiative, and a local authority electric vehicle policy were critically reviewed using discourse analysis. The method helped to reveal the explicit, implied and obscured aims of the examined initiatives. Using discourse analysis, the researchers developed a heuristic which could improve traditional policy analysis approaches. The examination of case studies illustrates how practitioners understand the notions of “urban climate justice” and “smart cities” and whether their conceptualisations differ from those present in the academic literature. Finally, the paper offers methodological suggestions for embedding justice in “smart” initiatives at each stage of policy and project design

Implications of "peak oil" for atmospheric CO2 and climate

Unconstrained CO2 emission from fossil fuel burning has been the dominant cause of observed anthropogenic global warming. The amounts of "proven" and potential fossil fuel reserves are uncertain and debated. Regardless of the true values, society has flexibility in the degree to which it chooses to exploit these reserves, especially unconventional fossil fuels and those located in extreme or pristine environments. If conventional oil production peaks within the next few decades, it may have a large effect on future atmospheric CO2 and climate change, depending upon subsequent energy choices. Assuming that proven oil and gas reserves do not greatly exceed estimates of the Energy Information Administration, and recent trends are toward lower estimates, we show that it is feasible to keep atmospheric CO2 from exceeding about 450 ppm by 2100, provided that emissions from coal, unconventional fossil fuels, and land use are constrained. Coal-fired power plants without sequestration must be phased out before mid-century to achieve this CO2 limit. It is also important to "stretch" conventional oil reserves via energy conservation and efficiency, thus averting strong pressures to extract liquid fuels from coal or unconventional fossil fuels while clean technologies are being developed for the era "beyond fossil fuels". We argue that a rising price on carbon emissions is needed to discourage conversion of the vast fossil resources into usable reserves, and to keep CO2 beneath the 450 ppm ceiling.Comment: (22 pages, 7 figures; final version accepted by Global Biogeochemical Cycles

The future role of natural gas in the UK: a bridge to nowhere?

The UK has ambitious, statutory long-term climate targets that will require deep decarbonisation of its energy system. One key question facing policymakers is the role of natural gas both during the transition towards, and in the achievement of, a future low-carbon energy system. Here we assess a range of possible futures for the UK, and find that gas is unlikely to act as a cost-effective ‘bridge’ to a decarbonised UK energy system. There is also limited scope for gas in power generation after 2030 if the UK is to meet its emission reduction targets, in the absence of carbon capture and storage (CCS). Without CCS, a ‘second dash for gas’ while providing short-term gains in reducing emissions, is unlikely to be the most cost-effective way to reduce emissions, and could result in stranded assets and compromise the UK's decarbonisation ambitions. In such a case, gas use in 2050 is estimated at only 10% of its 2010 level. However, with significant CCS deployment by 2050, natural gas could remain at 50–60% of the 2010 level, primarily in the industrial (including hydrogen production) and power generation sectors

Electricity portfolio innovation for energy security: the case of carbon constrained China

China’s energy sector is under pressure to achieve secure and affordable supply and a clear decarbonisation path. We examine the longitudinal trajectory of the Chinese electricity supply security and model the near future supply security based on the 12th 5 year plan. Our deterministic approach combines Shannon-Wiener, Herfindahl-Hirschman and electricity import dependence indices for supply security appraisal. We find that electricity portfolio innovation allows China to provide secure energy supply despite increasing import dependence. It is argued that long-term aggressive deployment of renewable energy will unblock China’s coal-biased technological lock-in and increase supply security in all fronts. However, reduced supply diversity in China during the 1990s will not recover until after 2020s due to the long-term coal lock-in that can threaten to hold China’s back from realising its full potential

Assessing the potential of utilisation and storage strategies for post-combustion CO2 emissions reduction

The emissions reduction potential of three carbon dioxide handling strategies for post-combustion capture is considered. These are carbon capture and sequestration/storage (CCS), enhanced hydrocarbon recovery (EHR), and carbon dioxide utilization (CDU) to produce synthetic oil. This is performed using common and comparable boundary conditions including net CO2 sequestered based on equivalent boundary conditions. This is achieved using a “cradle to grave approach” where the final destination and fate of any product is considered. The input boundary is pure CO2 that has been produced using a post-combustion capture process as this is common between all processes. The output boundary is the emissions resulting from any product produced with the assumption that the majority of the oil will go to combustion processes. We also consider the “cradle to gate” approach where the ultimate fate of the oil is not considered as this is a boundary condition often applied to EHR processes. Results show that while CCS can make an impact on CO2 emissions, CDU will have a comparable effect whilst generating income while EHR will ultimately increase net emissions. The global capacity for CDU is also compared against CCS using data based on current and planned CCS projects. Analysis shows that current CDU represent a greater volume of capture than CCS processes and that this gap is likely to remain well beyond 2020 which is the limit of the CCS projects in the database