Fireflies are small, easy to overlook, and deeply sensitive to change. When they disappear, it's often an early warning that something in the ecosystem is no longer in balance. In Bukit Kiara, one of Kuala Lumpur’s last remaining urban forests, fireflies have become a powerful signal of what is happening, as development pressures grow closer to sensitive habitats. So what are the fireflies of Bukit Kiara telling us, as these new pressures mount? We discuss the history of Bukit Kiara, the incredible biodiversity found there, the pressures the area is facing, and how a new initiative called The Glow Campaign is turning concern into collective action. Helping us do that are Tan Boon Hua, the Vice President of environmental rights NGO the Friends of Bukit Kiara, and Amelia Tan, the Founder and CEO of the social enterprise Conscious.