In a conversation with Luciana Julião, environment editor at The Conversation Brasil, during COP30 in Belém, Fiocruz researcher and environmental health specialist Sandra Hacon explained why the integration of climate, environment and health has guided her research for two decades. Hacon has a background in biology and ecology and is a member of the Amazon Scientific Panel (Painel Científico da Amazônia), the Climate Network of the Ministry of Science, Technology and Innovation (Rede Clima), and the National School of Public Health (ENSP).