Climate change threatens the balance of Earth’s biogeochemical cycles. The stoichiometric ratios of carbon, nitrogen, and phosphorus (C:N:P) shape ecosystem resilience, carbon sequestration, and nutrient flows. Human activities, such as intensive farming and the use of fossil fuels, distort these ratios, accelerating greenhouse gas emissions and soil degradation. Integrating stoichiometric principles into climate and land-use policies can strengthen ecosystem services, biodiversity, and long-term sustainability.