Paul Ehrlich is arguably the most infamous environmentalist of the modern era. His 1968 book The Population Bomb, raised awareness on the connections between exponential human population growth and environmental degradation. It is still iconic to some while a discomfort to others. But what Paul Ehrlic's has to say in his latest book, Humanity on A Tightrope, should find common ground with everyone. Which is what the book is about: how strengthening both empathy and a shared sense of kinship – even with seeming strangers living far away from us – are crucial steps to keep humanity from falling into global calamity.