Human interaction with the environment is comprehensively sustainable when it is positively affecting the well-being of both the environment and that of humans. We can learn this universal form of human-environment interaction by experiencing that sustainable actions of us are simultaneously affecting both our environment and our body positively. The digital extension of reality can enable us to have this unique body-environment experience. My current research and teaching activities therefore focus on the following question: how can such reality-expanding experience in humans establish their motivation for universal human-environment interaction?