6. The result of the study referred to in paragraph 5 of this Article will provide the essential information for the Commission to determine whether to adopt an implementing act in accordance with Article 48(3), to ensure the uniform application of modulation of en route charges to encourage airspace users to support improvements in climate and environmental performance such as the use of the most fuel-efficient available routing, increased use of alternative clean propulsion technologies including sustainable alternative fuels, while maintaining an optimum safety level.