BERLIN, 22 April 2026 — The head of UN Climate Change warned on Tuesday that rising fossil fuel costs tied to global conflicts are creating a new economic threat he called “fossil-fuel driven stagflation,” and urged an urgent acceleration of the clean energy transition to protect economies and households worldwide.
Speaking at the opening of the Petersberg Climate Dialogue in Berlin, UN Climate Change Executive Secretary Simon Stiell said recent turmoil — “this latest war,” he said — has locked in higher fossil fuel prices “for months and likely years to come,” delivering “a gut-punch to every nation and billions of households.” He warned the fallout goes beyond energy bills, arguing higher fuel costs are “driving up prices, driving down growth, pushing budgets deeper into quagmires of debt, and stripping away governments’ policy options and autonomy.”
Stiell framed accelerated climate action as an economic as well as environmental necessity. “Clean energy offers security and affordability – returning sovereignty to nations and their peoples,” he said, calling for negotiations to move from pledges to on-the-ground projects. Stiell urged that the UN’s Action Agenda, which he said has been “mobilizing trillions of dollars within the real economy,” must be elevated “to share centre-stage with negotiations” so implementation can pick up pace in both the global North and South.
The executive secretary underscored the need for measurable progress ahead of the second global stocktake at COP33. Referring to landmark commitments delivered under the Paris Agreement and the first global stocktake at COP28, Stiell said parties must show that they are “on track to meet the commitments made at the first” when COP33 reviews cumulative progress. He emphasised that while negotiations remain important, the priority now is scaling projects that reduce emissions and build resilience.
Stiell called for a stepped-up flow of finance into developing countries and stronger international cooperation to turn commitments into results. He identified priority sectors for immediate action: reforming energy systems, cutting methane emissions and strengthening food systems. On methane he warned of its potency, saying “slashing emissions by 2030 will have a huge impact on putting the brakes on global heating.” He also stressed resilience measures, noting that “early warning systems save lives on a huge scale.”
The warnings come as small island states in the Pacific face acute consequences of both climate impacts and elevated energy costs. Pacific leaders and regional advisers have already raised alarms about surging international oil prices and the knock-on effects for fuel and fertiliser imports. Stiell’s call for more finance and rapid deployment of clean energy and resilience measures underlines the stakes for vulnerable economies that have limited fiscal room to absorb prolonged price shocks.
UN Secretary-General António Guterres has echoed similar urgings at international forums in recent weeks, pressing nations to “unleash the renewables revolution.” For negotiators and finance ministers, Stiell’s intervention adds urgency to the run-up to COP33: governments must now demonstrate concrete pipelines of implementation — from financed projects to operational early warning systems — if global stocktakes are to show the world is moving off fossil-fuel dependence and toward greater economic and climate security.