 Hi, I'm Jason Ren from Princeton University. I'm a professor in the Department of Civil and Environmental Engineering and Associate Director at the Ellinger Center for Energy and the Environment. The LET conference is really one of my favorites because it always brings thought leaders from all over the world and you can learn from them the cutting edge research and technology development. In addition, you also get to know many young talents and their exciting works. So I look forward to seeing you very soon. Recently, I've been thinking and working with collaborators on how to decarbonize our wastewater sector, but also requiring resources for circular economy. We've made many progress including an open access book, quite a few articles, and certainly many partnerships with academia and industry. I hope to share the experience and offer my thoughts and findings so we can work on this important topic together. Thank you.