Energy Environmental science, engineering & technology 2 Alternative & renewable energy sources & technology 1 Artificial life 1 Biodiesel 1 Carbon 1 Carbon dioxide 1 Carbon intensity 1 Civil engineering, surveying & building 1 Closed loop systems 1 Closed-loop system 1 Crude oil 1 Diesel engines 1 Ecodesign 1 Energy utilization 1 Environmental impact 1 Extraction 1 Floods 1 Flue gases 1 Fossil fuel technologies 1 Greenhouse gases 1 Heat losses 1 Heat transfer 1 Heavy oil production 1 Heavy oil recovery 1 Heavy oil reservoirs 1 Hydro-carbon gas 1 Hydrocarbon gas 1 Hydrocarbons 1 Hydrothermal liquefaction 1