EnvironmentHow to do a health check on your garden’s vital earthworm population Earthworms are a great indicator of the state of soil. Science of gardening columnist Clare Wilson explains how to tell how many you have - and how to entice more naturally, if needed Regulars
VideoExtinction lottery: how should we choose which species to save? When we decide which species will survive the age of humans, we need to question conservation's fundamental beliefs, argues Rebecca Nesbitt. Video