The world remains dangerously unprepared for the escalating risks of climate change, according to a group of leading scientists who are urging the creation of an internationally mandated global risk assessment to clarify what is at stake and what can still be avoided.
In a new paper published in the journal Nature, experts warn that despite overwhelming scientific evidence of accelerating planetary warming, there is still no “authoritative and up-to-date assessment” focused specifically on avoidable climate risks. Without such a coordinated global analysis, governments may be underestimating the scale of the threat, misdirecting resources, and implementing mitigation strategies that fail to address the most catastrophic potential outcomes.
The consequences of a warming world are no longer theoretical. Across Europe last year, record-breaking heatwaves claimed thousands of lives and triggered widespread wildfires. In Spain alone, more than 380,000 hectares of land were scorched. A major study conducted by researchers at Imperial College London and the London School of Hygiene & Tropical Medicine examined 854 European cities and found that climate change was responsible for 68 per cent of the estimated 24,400 heat-related deaths last summer. Rising temperatures in some places by as much as 3.6°C dramatically intensified the impact.
Warmer air also holds more moisture, increasing the likelihood of heavier rainfall and more destructive storms. For every one-degree Celsius rise in air temperature, the atmosphere can retain roughly seven per cent more moisture, creating conditions for severe downpours and overlapping tropical storms. Asia experienced this reality firsthand last year, when successive storm systems compounded flooding and devastation across multiple countries.
Yet scientists caution that policymakers may still be responding in fragmented or insufficient ways. Sea-level rise, for example, demands more robust flood defences, but the long-term implications could extend far beyond reinforcing coastlines. Entire sections of major cities from London to New York may eventually become uninhabitable if greenhouse gas emissions continue unchecked. Likewise, while authorities acknowledge that hotter summers will increase mortality rates, few are fully prepared for scenarios involving tens of thousands of deaths in a single region during extreme heat events that exceed the limits of human tolerance.
Professor Rowan Sutton, Director of the Met Office Hadley Centre, argues that humanity still has a narrow window to avoid the worst impacts of climate change and shape a more liveable and prosperous future. However, he insists that this opportunity depends on clarity. A comprehensive global assessment of avoidable climate risks would allow political leaders and citizens to understand the magnitude of the danger and the benefits of decisive action while time remains.
Such an assessment would not merely catalogue threats. Instead, it would provide an authoritative overview of the most significant risks, their potential impacts, and the likelihood of catastrophic outcomes. Crucially, it would also outline the pathways societies can still choose to prevent worst-case scenarios. Rather than fostering despair, proponents argue, it would highlight human agency and the tangible benefits of timely mitigation.
Developing such a framework would be complex. Climate science is multifaceted, regional impacts vary widely, and risks evolve rapidly. Political and economic barriers, alongside limitations in data-sharing, have thus far hindered the creation of a unified and regularly updated global system accepted across nations.
Professor Peter Scott, a climate scientist at the University of Exeter and the Met Office, describes the current moment as a crossroads in global climate efforts. Bridging the gap in global risk assessment, he says, is now an urgent priority. An internationally mandated, transparent evaluation of avoidable climate risks would clarify the scale of both danger and opportunity, helping governments safeguard their populations and economies before irreversible thresholds are crossed.
As emissions continue to climb and extreme weather intensifies, scientists warn that delay carries escalating costs. The question is no longer whether climate risks exist, but whether the world will act decisively armed with a clear and unified understanding of what remains within its power to change.