For decades, the soil beneath our feet was treated as a “black box” in global climate and ecosystem models. We knew that soil microbes were responsible for critical biogeochemical cycles, yet their immense diversity and the complexity of their interactions meant they were often simplified into static parameters or ignored entirely as “functionally redundant”. My career as a researcher has been dedicated to prying open this black box, using emerging molecular tools and ecological theories to understand how microbial communities regulate Earth’s climate, respond to global change, and can even be harnessed for environmental remediation.