In gasification, on the other hand, oxygen is normally supplied to the gasifiers and just enough fuel is combusted to provide the heat to gasify the rest; moreover, gasification is often performed at elevated pressure. The resulting syngas is typically at higher pressure and not diluted by nitrogen, allowing for much easier, efficient, and less costly removal of CO2. Gasification and integrated gasification combined cycle's unique ability to easily remove CO2 from the syngas prior to its combustion in a gas turbine (called "pre-combustion" CO2 capture) or its use in fuels or chemicals synthesis is one of its significant advantages over conventional coal utilization systems.