Search

As cities work to reduce their total greenhouse gas (GHG) emissions, the transportation sector is lagging, accounting for a growing percentage of total emissions in many cities. The provision of public transit, and specifically urban rail transit, is widely seen as a useful tool for reducing urban transportation GHG emissions. More research, however, is needed to understand the net impact of new metro rail infrastructure on urban emissions and guide efforts to maximise the GHG savings through rail investments. This paper examines the net GHG emissions of the Jubilee line extension (JLE) in London, UK. The GHG emissions associated with construction, operation, ridership and changes in urban density associated with the provision of the new metro rail infrastructure are assessed. These components are then combined and compared to calculate the net GHG impact across the study period, which extends from opening in 1999 through 2011. The capital GHG emissions from construction of the JLE are calculated as 530 kilotonnes carbon dioxide equivalent (CO2e). The initial mode shift from other rail lines and long-term mode change from automobiles result in yearly GHG savings from riders on the JLE. A quasi-experimental analysis of land-use change near the JLE finds no calculable GHG saving from increased residential density. The GHG payback period is calculated between 13 and 19 years. [ABSTRACT FROM AUTHOR]

The Thames Tideway tunnel is a large sewer running up to 66 m below the tidal river Thames in London, UK. Its construction, started in 2016, was urgently needed to protect the tidal Thames from pollution due to the combined sewer overflows of untreated sewage that every year are spilled into the river. This paper reports on an exercise for evaluating the environmental impact associated with the construction process of the east section of the tunnel quantified by means of a life-cycle assessment, which not only primarily considered carbon dioxide emissions, but also took into account a wider series of impact categories. Operational and decommissioning impacts were not included. The results indicated the processes with the greatest effects on the environmental performance of the east sector construction and hence where alternatives on the design or materials used needed to be considered. [ABSTRACT FROM AUTHOR]

Urban design and sustainability are critical issues in creating better urban environments. The UK government is endorsing sustainability through its sustainable communities agenda and is urging the public, private and third sectors to emphasise high quality design in their urban development projects. However, with little guidance as to how to design sustainable urban development projects, decision-makers may end up wasting time, money and resources in projects that are unsustainable for themselves, the community and beyond. One option for decision-makers is loosely to follow a generic process for urban design that demonstrates, by way of a series of stages and activities, when to make decisions and to consider sustainability, what tools are needed to make decisions and who should be making decisions. To further the understanding of the use of a process in sustainable urban design decision-making, a baseline model was first created that amalgamates stages and activities from relevant processes found in a variety of disciplines and professions. A case study was then conducted, showing the process for the urban design and development of Brewhouse Yard, Clerkenwell, London. Through analysis of interviews, archival material and site analysis, three distinct periods of the process were discerned. These periods are discussed by way of process stages, decisions, tools and sustainability. The paper then compares this process with the baseline process to understand how the former can help improve the latter as a tool for assisting decision-makers in creating more sustainable urban environments. [ABSTRACT FROM AUTHOR]

The London 2012 Olympic Park transport and environmental management schemes framework was established through the planning process and subsequent S106 of the London 2012 Olympic Games and Paralympic Games 2007 planning consent. It provides a mechanism to allow the host boroughs to mitigate the effects of the London 2012 Olympic Park development through environmental transport management procedures, rather than only junction capacity schemes. This satisfied the boroughs' sustainability ambitions and assisted delivery of the Olympic Delivery Authority's primary sustainability aims. [ABSTRACT FROM AUTHOR]