Through the consequent use of Best Available Technologies in every sector of human activities the input of energy and material consumption can be reduced, so that the efficiency of the respective process gets better and the overall impact on the environment is less. The ecological footprint gets better and also money can be saved. Some organizations or states have worked on this since years; compare e.g.: https://www.oecd.org/chemicalsafety/risk-management/best-available-techniques.htm or https://www.eea.europa.eu/themes/air/links/guidance-and-tools/eu-best-available-technology-reference , respectively https://eippcb.jrc.ec.europa.eu/reference/ or e.g: https://www.fueleconomy.gov/FEG/tech_adv.shtml. Examples in the field of Renewable Energies, e.g.: https://oceanup.com/36670/best-renewable-energy-technologies or https://www.treehugger.com/top-renewable-energy-sources-1204190 ; last visit on the sites on 2021-10-31 . We need also new technologies  for a sustainable future by further research & development.