decarbonisation History of engineering & technology 5 energy efficiency 5 CO2 emissions 4 renewable energy 4 Technology: general issues 3 climate change 3 energy transition 3 optimization 3 sustainability 3 carbon footprint 2 circular economy 2 decarbonization 2 energy saving 2 indicators 2 integrated assessment 2 renewable energy sources 2 1.5 °C mitigation pathway 1 100% renewable energy 1 2050 carbon neutrality 1 Acree model 1 BREEAM methodology 1 Betonbautechnik 1 Big Five 1 Brazil 1 CAFE standards 1 CFD modelling 1 CO2 1 CO2 Constrained Energy Planning (CCEP) 1 CO2 capture 1