human must control need. not eat too much. eat enough. change all produce to unpolution. change industry, transport, device,etc to unpolution. not use material from wood tree. not cut tree. not use tree to make house, furniture, assecories, paper, etc. land will full of human. human food from fish. human make fish many. clean water make fish grow. animal in zoo. tree in forest and plants on all house make world fresh air and healthy. unpolution make weather work normal. human must prevent all disaster. can?
