With an eye on World Vegetarian Day we're looking at the feasibility of a reduced meat diet: What can cutting down calories from meat do for our health, and the health of the planet? Plus, in the news, a new 20 minute test for COVID, why hybrid cars turn out to be worse for the environment than their official performance figures claim, and after hundreds of elephants mysteriously died in Botswana, researchers now think they know why... Like this podcast? Please help us by supporting the Naked Scientists