Last month, we were told, the 8 billionth person was added to Earth's human population. But despite many acknowledging that some of the biggest threats facing us and the planet, like climate change - stem from our impact on world, and the more of us there are, the worse those threats will be, the topic of population is mysteriously absent from the dialogue at major international fora, like the recent COP27 meeting in Egypt. Surely "living sustainably" must include, as David Attenborough puts it, not over-running the planet and destroying it in the process?So how many people can, or should the... Like this podcast? Please help us by supporting the Naked Scientists