Facing with higher and higher degree of city concentration, increasing air pollution, gradual loss of the nature, aging issues that plague everyone as well as disaster relief and tsunami, how will people live in the 21st century? How can we live a happy life? In this book, ""How to Live in the 21st Century"" written by Yoro Takeshi and Kengo Kuma, these two experienced and high professional academics give their understanding of the above questions.