Are people always bad news for nature? And is there anywhere we haven't had an impact?  Dr Sarah-Lan Mathez-Stiefel is a Senior Research Scientist at the Centre for Development and Environment at the University of Bern, and Senior Advisor for the Regional Hub South America of the Wyss Academy for Nature. She has a long history with A Rocha, having first met Peter aged 11!  Now in her 40s, Sarah-Lan has had an impressive career in the fields of sustainable development, natural resource management and conservation. One of her particular passions in ethnobiology – the study of different societies and their relationship to nature.  An excellent communicator, she speaks with clarity and wisdom about the way ahead of nature, about the transformation of Indigenous knowledge, and how societies respond to nature in the 21st century.