Pollution is one of the biggest problems facing the environment today and is a leading cause of death. Air and water pollution has affected the environment for many years, causing diseases in people, especially children. The document examines early childhood growth in Australia and Tanzania, discussing how clean or polluted the air and water is in each country and the effects of limited access to clean water and primary needs on children's lives and development. It also discusses how air pollution can cause chronic health issues in children.