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As we consider the most effective paths to achieve carbon neutrality by 2050, nature provides us with a laboratory of 3.5 billion years of energy efficiency improvements. Geomimicry – biomimicry at the service of the climate – opens up leads into decarbonizing industrial processes (moving from a thermic to an organic industry) and to strengthen natural carbon sinks. Symbioses between living beings are key to biomimicry, whether for the synthesis of materials or for the cycle of transformation of atmospheric CO2 into stable and inert forms of carbon. Therefore, it is critical to study these symbioses in depth and place them at “our service”, with the aim of replacing fossil fuels and resisting the temptation for geoengineering. This requires an actual public climate policy.