Following the initiation of the European Union Emissions Trading Scheme (EU ETS) in 2005 the scheme has received significant criticism pertaining to a lack of transparency in its operational mechanics and an inability to present conclusive evidence that it has encouraged a reduction in monitored emissions. This study utilizes an adaptation of the event study methodology proposed by Ball and Brown (1968) and Fama et al. (1969) in order to assess the impact of the EU ETS on emissions in the European oil and gas sector as a sample reflective of the scheme on the whole. In doing so, this study compares the annual emissions of carbon dioxide, nitrous oxide and methane for dual listed, single listing and cross listed oil and gas companies on the ...