This study investigates the greenhouse gas (GHG) emissions associated with the manufacture and placement of concrete, aiming to provide accurate data for environmental sustainability design (ESD). The research collected life cycle inventory data from various sources, including quarries and concrete manufacturing plants, to quantify CO₂ emissions. The primary source of CO₂ emissions was found to be Portland cement, responsible for 74% to 81% of total emissions. Coarse aggregates contributed 13% to 20%, with electricity being the major source of emissions in their production. Fine aggregates produced 30% to 40% of the emissions compared to coarse aggregates. Fly ash and ground granulated blast furnace slag (GGBFS) were found to reduce CO₂ emissions by 13% to 22% in typical concrete mixes. The study concludes that reliable data on GHG emissions can be used to compare concrete with other construction materials and recommends that rating schemes for alternative materials should be based on such data.This study investigates the greenhouse gas (GHG) emissions associated with the manufacture and placement of concrete, aiming to provide accurate data for environmental sustainability design (ESD). The research collected life cycle inventory data from various sources, including quarries and concrete manufacturing plants, to quantify CO₂ emissions. The primary source of CO₂ emissions was found to be Portland cement, responsible for 74% to 81% of total emissions. Coarse aggregates contributed 13% to 20%, with electricity being the major source of emissions in their production. Fine aggregates produced 30% to 40% of the emissions compared to coarse aggregates. Fly ash and ground granulated blast furnace slag (GGBFS) were found to reduce CO₂ emissions by 13% to 22% in typical concrete mixes. The study concludes that reliable data on GHG emissions can be used to compare concrete with other construction materials and recommends that rating schemes for alternative materials should be based on such data.