TUNZA: Acting for a Better World is in part a call to action and in part a casebook showing how young people are challenging the status quo in their homes and their communities.This publication is not just about the environment or its problems. It is also about acting together for change. Its aim is to show that there is hope and that successes are happening every day. Our understanding of the interdependence between our planet and ourselves has also been transformed. The report is presented in a way that can be easily understood with ideas on how to address environmental problems.Land is a key part of the Earth System. It is where we live, increasingly in growing concentrations in cities. Land is where we grow or graze what we eat. It sustains trees that produce the oxygen we need to breathe and stores the CO2 that would otherwise be released to the atmosphere. The Earth has limits. There are signs that we will reach ours. But what does this mean from a land perspective?