About half a century has passed since Professor Peter Singer initiated the Animal Liberation movement. In the beginning, there was prejudice. People criticized him for his “unnecessary” interests about fighting against “speciesism” and for rights of nonhuman beings. But today, it has become the mainstream agenda with abundant shared interests from people all over the world extending their concern to all sentient beings. More people are turning away from a diet of animal products, in protest against the cruelty that factory farms inflict on tens of billions of animals every year and the waste of grains and soybeans that it involves. Moreover, this diet is a threat to our climate, and to our own health. Professor Singer reminds us of the fact that 3 out of every 4 new infectious diseases today originate from animals. The old ways of doing things by humans, including fossil fuel based economy and factory farming, are now seriously threatening the future of all living beings. How should we assess and understand these overwhelming issues most correctly and what should we do to live more ethically in the 21st century? Reducing risks has now become one of the most important agendas for our future. What should we do and how can we stop inflicting so much suffering on animals, avoid catastrophic climate change, and protect the remaining areas of biodiversity? Also, how should political leaders understand and approach these life-threatening issues? Professor Singer sits with us and discusses what we should do.