Ecosystems are the web of life on Earth. They comprise of all the living organisms, the interactions among them and with their surroundings. They exist, from a grain of soil to the entire planet, and include forests, rivers, wetlands, grasslands, estuaries and coral reefs. Natural ecosystems are important for our physical and mental health, and for our identity. They are home to precious wildlife. For many, they are a source of wonder and spirituality. Choose an ecosystem, journey through it to understand it's complex web and the benefits it provides to us.