Why Decarbonisation Alone Is Not Enough

Part 2: Why Decarbonisation Alone Is Not Enough For more than two decades, decarbonisation has been the defining objective of the global energy transition. It has driven remarkable advances in renewable energy, energy efficiency and carbon capture. These achievements deserve recognition. Yet they also reveal an important reality: reducing emissions alone does not fully address the underlying challenge. The world’s economy continues to depend heavily on newly extracted fossil carbon. Even if emissions are reduced through cleaner technologies, fossil carbon still enters industrial systems every day to produce electricity, fuels, chemicals and materials. As long as this dependence continues, the transition remains incomplete. This is why the next phase of the energy transition should look beyond emissions and consider the source of the carbon itself. Defossilisation is the progressive replacement of continuously extracted fossil carbon with renewable energy, renewable hydrogen and circular carbon systems. It does not replace decarbonisation—it builds upon it. Carbon capture, renewable electricity and efficiency remain essential, but they become part of a broader engineering strategy aimed at reducing reliance on geological carbon. A practical pathway combines three complementary actions: * Continue reducing emissions through renewable energy, efficiency and carbon capture. * Recycle captured carbon wherever it can be used productively instead of continually introducing new fossil carbon. * Integrate renewable hydrogen with circular carbon pathways to produce sustainable fuels and industrial feedstocks. This systems approach recognises that carbon itself is not the problem. Carbon is fundamental to modern society. The challenge is how we obtain it and how we manage it throughout its life cycle. Ultimately, the success of the energy transition will not be measured only by lower emissions. It will also be measured by how effectively we reduce our dependence on continuously extracted fossil carbon while maintaining reliable, affordable and resilient energy systems. Decarbonisation reduces emissions. Defossilisation transforms the system. #Defossilisation #EnergyTransition #CircularCarbon #Hydrogen #CCUS #CleanEnergy #SystemsEngineering