Carbon Dioxide Emission and Bio-Capacity Indexing for Transportation Activities: A Methodological Development in Determining the Sustainability of Vehicular Transportation Systems
Posted: 17 Jul 2018
Date Written: October 1, 2018
CO2 emissions from urban traﬃc are a major concern in an era of increasing ecological disequilibrium. Adding to the problem net CO2 emissions in urban settings are worsened due to the decline of bio-productive areas in many cities. This decline exacerbates the lack of capacity to sequestrate CO2 at the micro and meso-scales resulting in increased temperatures and decreased air quality within city boundaries. Various transportation and environ-mental strategies have been implemented to address traﬃc related CO2 emissions, however current literature identiﬁes diﬃculties in pinpointing these critical areas of maximal net emissions in urban transport networks. This study attempts to close this gap in the literature by creating a new lay-person friendly index that combines CO2 emissions from vehicles and the bio-capacity of speciﬁc traﬃc zones to identify these areas at the meso-scale within four ranges of values with the lowest index values representing the highest net CO2 levels. The study used traﬃc volume, fuel types, and vehicular travel distance to estimate CO2 emissions at major links in Dhaka, Bangladesh's capital city's transportation network. Additionally, using remote-sensing tools, adjacent bio-productive areas were identiﬁed and their bio-capacity for CO2 sequestration estimated. The bio-productive areas were correlated with each traﬃc zone under study resulting in an Emission Bio-Capacity index (EBI) value estimate for each traﬃc node. Among the ten studied nodes in Dhaka City, nine had very low EBI values, correlating to very high CO2 emissions and low bio-capacity. As a result, the study considered these areas unsustainable as traﬃc nodes going forward. Key reasons for unsustainability included increasing use of motorized traﬃc, absence of optimized signal systems, inadequate public transit options, disincentives for fuel-free transport (FFT), and a decline in bio-productive areas.
Keywords: Carbon Dioxide (CO2) Emission, Transportation Sustainability Rating, Bio-Capacity, Urban Transport, Low Carbon Transport
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