Ailing Planet

1. Principal Biological System of Earth

1.1. They form the foundation of the global economic system. They supply us food and provide all race materials for industries except minerals

1.1.1. Fisheries

1.1.1.1. Overfishing

1.1.2. Forest

1.1.2.1. Destroyed to obtain wood

1.1.3. Grassland

1.1.3.1. Burning to desert

1.1.4. Croplands

1.1.4.1. Decreasing