When we think about why we practice sustainable living, there are many different reasons why we do what we do. There are different philosophical approaches – intrinsic value, value to humanity, economic value, social justice, etc. For most of us though, at least part of our reasoning is to sustain what we currently have (at least) for future generations. What we do now will have great impact on what our children will have later. Already, children suffer many ailments from generations of misuse of our air, water, and food systems. Obesity, respiratory issues, invasive diseases, malnutrition, and a host of other illnesses plague our youth because of our poor decisions – both past and present. In a very practical sense, we must start to make changes now to ensure not only the preservation of our environment for future generations, but also their viability and survival. Part of this effort must include activating youth to understand their current reality and the changes that need to be made for a better future. Birke Baehr, an 11-year-old activist, is a part of this movement and a key to a sustainable future. Take a minute to watch his five minute presentation at TED.