The Earth, our planet, is inhabited by an amazing range of living things, from giant animals like whales to microorganisms that are too small to be seen by the human eye. Land and sea, rivers and mountains, all sorts of places are brimming with life, and all the lifeforms have a profound influence on each other. They form a network of life. It is thanks to these bonds that the Earth is the “Planet of Life,” a precious jewel in the universe. However, the network of life that has been built up over hundreds of millions of years is now in great danger.