Thanks to your participation and support. 2019 6th International Conference on Environmental Systems Research has been successfully held in Melbourne, Australia, 18-20 December, 2019. As the organizing committee, we hope every delegate has enjoyed the conference and taken the chance to experience the culture and history of the city. Although we have had a small group of participants this year, we have met some old friends and also made some new friends. Hopefully, we'll be able to see each other again next year.