Is it unethical to eat animals? Can you be a good person if you have spare money and don’t give any of it to charity? What is the moral response to the war in Ukraine? Nuala McGovern is in Los Angeles to talk to Australian Philosopher and Berggruen Prize winner Prof Peter Singer, who has spent his career grappling with these difficult questions. He’s been described as the world’s most influential philosopher and, on one occasion, as the world’s most dangerous man.