Moscow is currently experiencing temperatures that have shattered historical records, with the mercury hitting 35.2°C in the city centre this afternoon. This is not an anomaly, but part of a pattern that has seen the Russian capital swelter through its hottest June on record. The immediate cause is a persistent anticyclone that has drawn hot air from the Sahara and the Middle East, but the underlying driver is the inexorable warming of the planet. As I have noted before, the physics is simple: greenhouse gases trap heat, and we have added enough to raise the global average temperature by 1.2°C since pre-industrial times. The consequences, however, are anything but simple.
Across the Arctic, the heat is accelerating the thaw of permafrost, which stores vast amounts of carbon. The UK Met Office has just released a sobering assessment: the probability of exceeding the 1.5°C threshold within the next five years is now 66%, up from 10% a decade ago. This is not a political statement, but a statistical projection based on current emissions trajectories. And it brings us uncomfortably close to the climate tipping points that scientists have long warned about.
A tipping point is a threshold beyond which a system undergoes a rapid, irreversible change. Think of a canoeist leaning too far: at a certain angle, the canoe capsizes and cannot be righted. For the climate, these include the collapse of the West Antarctic Ice Sheet, the dieback of the Amazon rainforest, and the release of methane from Arctic permafrost. The UK scientists, from the University of Exeter and the British Antarctic Survey, have identified that the Earth system is “at risk of destabilisation” if global warming exceeds 2°C. We are currently on track for 2.7°C by 2100.
The Russian heatwave is a case in point. The city of Moscow recorded its highest ever June temperature at 35.2°C on 2nd June, breaking the previous record set in 2018. But it is not just the extremes: the average temperature for the month was 5°C above normal. This is consistent with climate models that predict more intense and frequent heatwaves in northern latitudes as the jet stream becomes more wavy and stagnant. The physical reality is that the atmosphere holds more moisture as it warms, leading to both more extreme precipitation and longer dry spells.
The response from the Russian government has been muted. The Kremlin has historically been slow to acknowledge the role of human activity in climate change, given its reliance on fossil fuel exports. But the data does not lie. The heatwave has already caused widespread crop failures, power outages, and wildfires in Siberia. The economic cost is mounting, and the health toll is being felt in cities where infrastructure was not designed for such temperatures.
Meanwhile, the UK scientists’ warning is a stark reminder that we are running out of time. The tipping points are not distant possibilities; they are becoming more probable with each passing year. The collapse of the Greenland Ice Sheet, for example, would commit the world to 7 metres of sea level rise over centuries. The Amazon, which has already lost 17% of its forest cover, may reach a point where it can no longer sustain its own rainfall, turning from a carbon sink into a source.
The solutions are known: rapid decarbonisation of energy systems, scaling up of renewable technologies, and investment in adaptation. But the political will remains insufficient. The International Energy Agency recently reported that global renewable energy capacity additions reached a record 295 gigawatts last year, yet fossil fuel demand still increased. The gap between what is being done and what needs to be done is widening.
In my capacity as a science correspondent, I have to report the numbers. The numbers are stark. The numbers demand action. The planet is sending us a signal, and it is loud and clear. We must listen before we reach the tipping points that will define the future of our biosphere. The choice is not between economy and environment, but between short-term gain and long-term catastrophe.
For now, Moscow swelters. The permafrost thaws. The ice sheets melt. The clock ticks. This is not a drill. This is the physical reality of a world in transition, and we are the generation that must act.
