We are developing environmentally-benign materials by polymer chemistry. For example, bioplastics having stimuli-responsive degradability for overcoming marine-plastic issues. Various creatures coexist on earth. Individual creatures make their own living activities according with their environments. Human beings had accorded with the earth environments until the Industrial Revolution, as other beings did. Since the revolution, the human beings have found the methods to control their environments as they liked. One day, the environment control ran violent to break the earth environments, and now they destroy their own environments. Global warming, extraordinal living systems, ozone hole, desertification, extreme event, endocrine disrupters, salt damage, red tide, photochemicals mog. etc. have been getting serious year by year. These problems are exterminating weak creatures, and in future may be going to exterminate all the creatures on the earth, containing us, human beings. In the last period of 20th century, scientists stood up and took action to solve the problems. However, the environmental problems were much more serious than predicted. Extremely high and thick walls interfered with their actions. Nevertheless we Kaneko Lab. members develop the biomass-derived materials for the protection of the earth environment by making enormous efforts. We are now developing novel organic ecomaterials having electronic, photonic, and structural functions. Then we are really aiming at the realization of our materials in sustainable society as sacran has already been applied practically in the fields of cosmetics, apparels, and pharmaceutics.