Sustainable worlds - this issue of Tunza focuses on making the most of what we have, but using it sustainably. It features some remarkable Bayer Young Environmental Leaders and their innovative approach to helping others and building a better world; new developments including the first lab-bread hamburger and carbon farming; new ideas such as encouraging microbes in our environment - we actually need them; and examines how we can develop green super-highways and how our cities can help the world to go green. more ...