For a long time, the energy transition was thought of as a gradual, almost comfortable evolution, built on the continuity of the economic and industrial models of the twentieth century. The idea was one of slow adaptation: a bit more renewables, a bit less fossil fuels, a few technological adjustments, without fundamentally questioning the system. But this vision now belongs to the past. Climate change has imposed a rupture that leaves little room for hesitation.
Climate disruption is no longer an abstract projection or a distant horizon. It is already visible, tangible, and measurable: extreme heatwaves, prolonged droughts, massive wildfires, and repeated floods. These phenomena are not isolated; they reflect a global dynamic that is accelerating. Above all, they remind us of a key reality: the climate does not negotiate. It does not adapt to political cycles or economic constraints. It responds only to the accumulation of greenhouse gas emissions.
In this context, inherited energy models are reaching their limits. They were built on abundant and cheap fossil energy, continuous growth, and the ability to externalize environmental impacts. Today, these three pillars are simultaneously weakening. Fossil fuels are not running out, but their large-scale use is becoming incompatible with climate stability. Growth itself is hitting physical limits, and environmental costs are returning in the form of systemic crises.
What is also changing profoundly is the sense of time. The old model relied on a logic of delay: action would come later, emissions would be reduced gradually, systems would be adjusted step by step. But this “later” logic is no longer viable. Every year of delay reduces future room for maneuver and makes the transition more abrupt, more costly, and more difficult. The longer we wait, the fewer real choices remain.
We must therefore accept a central idea, sometimes difficult to integrate: there is no longer real choice about the necessity of the energy transition. Not because there is only one technical solution, but because the direction is imposed by the physical constraints of the climate system. Moving away from fossil fuels is no longer one policy option among others, but a condition for the stability of the Earth system.
However, reducing the transition to a simple change of energy sources would be a mistake. It implies a much deeper transformation affecting all systems of production, transport, urban planning, and consumption. It is not just about replacing oil or coal with renewable energy, but about rethinking the very structure of our energy-based societies. This also includes choices about lifestyles, uses, and collective priorities.
In this transformation, two concepts become central: sufficiency and energy efficiency. Sufficiency does not mean deprivation, but reducing unnecessary or excessive consumption. Efficiency means producing the same, or more, with less energy. These levers, often less visible than large infrastructures, are nevertheless essential to addressing the climate emergency.
In reality, the energy transition can no longer be understood through the models of the past. Those models were based on an implicit idea of continuity: continuing to grow, continuing to consume, continuing to optimize without changing the overall logic. But this continuity is no longer compatible with the physical limits of the planet. The issue is therefore not simply to adjust the existing system, but to reconfigure it.
This does not mean that everything is fixed or predetermined. There are multiple possible pathways, multiple technological and social combinations. But they all converge toward the same constraint: rapidly reducing greenhouse gas emissions. Within this narrowed space, inaction is no longer neutral. It becomes a trajectory in itself, with increasingly heavy consequences.
Yet this constraint can also bring clarity. It forces us to abandon illusions of continuity and to face reality: the old energy model will not return. What remains to be decided is not the overall direction, but how we follow it, whether in an anticipatory and organized way, or under pressure and crisis.
We are therefore no longer in a phase of open choices as before, but in a phase of imposed transformation. Forgetting past models is no longer an intellectual option; it is a practical necessity. The energy world that structured the last two centuries is closing. And in this new space, the question is no longer whether the transition will happen, but how it will unfold and at what human, economic, and ecological cost.