Cities across the globe are growing fast. Today many cities are simply unsustainable, with polluted air, excessive energy consumption and an absence of nature. But big cities don't have to mean a dystopian future. They can be turned around to be powerhouses of wellbeing and environmental sustainability - if we empower women. C40 Cities - a global network of the largest and greenest cities across the planet - is leading the world delivering practical environmental changes right now. The mayors and city leaders of C40 are committed to make cities good for people and the planet. To help realise this, they have launched Women4Climate, an initiative to promote and support women as climate leaders. This book is a unique collaboration between C40 and Friends of the Earth showcasing pioneering city mayors, key voices in the environmental and feminist movements, and academics. The articles and interviews collectively demonstrate both the need for women's empowerment for climate action and the powerful change it can bring. Think of it as a rallying call - for the planet, for women, for everyone.