We are at a critical juncture. The choices made in the next few years will determine what kind of world our children and grandchildren inherit. The science on this is not ambiguous: the window to hold warming to 1.5 degrees Celsius is closing, and it is closing faster than most people appreciate. That reality demands honesty, not comfort.
Why One and a Half Degrees?
Warming does not scale evenly — its impacts grow non-linearly, much like the Richter scale, where the difference between 2 and 3 is nothing like the difference between 1 and 2. That multiplier effect matters enormously when we talk about what the climate can absorb.
A decade ago, world leaders gathered at the United Nations climate conference in Paris and committed to keeping global temperatures well below 2° Celsius, with an ambition to limit the rise to 1.5°. That commitment was built on decades of research by scientists across the world.
When scientists talk about global warming, they measure it from the industrial revolution, averaged over a 30-year period, to smooth out natural swings like El Niño or volcanic activity. Since Paris, the evidence has only grown stronger: 1.5° is the threshold below which human life and the environment can still function sustainably. Push past it and we risk crossing irreversible tipping points — changes we cannot undo and cannot afford to dismiss. That is why 1.5° is not a political aspiration. It is a physical boundary.
Tipping Points: Irreversible Turning Points
The Earth is not a simple machine. It is a web of interconnected systems balanced on fine margins. As we approach tipping points, whole systems can cascade — ecosystems unravel, and the economic and social structures built on top of them follow. Once those thresholds are crossed, the pace of change can easily outrun our ability to respond.
Listening to Those Who Hear the Earth
Scientists are clear that with every 0.1° of additional warming, the probability of triggering one of these irreversible tipping points rises. Dealing with that risk requires real shifts in politics, policy, and public thinking. Downplaying the threat for short-term political advantage is not just irresponsible — it is dangerous. So is spreading misinformation or deepening division at exactly the moment we need to pull together. Icelanders have always faced natural forces as a community. We know what it means to stand together when the ground shakes or the weather turns. We need that same instinct now, pointed at the climate. Our leadership matters.
Iceland Among Sinking Island Nations
For years, small island nations have been asking the world to cut emissions. They are not speaking in abstractions — entire villages in tropical regions have already been relocated because of rising sea levels. It is a preview of what is coming if emissions stay on their current path.
Recent data on the Atlantic Meridional Overturning Circulation (AMOC) has placed Iceland in that same conversation, alongside nations facing existential risks from climate change. At the ongoing United Nations climate conference in Brazil, the state of the AMOC has been a live topic, serious enough that our government and the Minister of Environment, Energy, and Climate convened a National Security Council to examine it.
The AMOC is not the same thing as the Gulf Stream, though the two are often confused. It is a system of currents running through the Atlantic Ocean, carrying warm surface water northward and cold deep water southward. Recent scientific analysis points to a significant risk of the AMOC weakening or collapsing if global temperatures keep rising — and that would be an irreversible tipping point. For Iceland, it would mean the disruption of the warm currents that define our climate. More broadly, it could bring a sharp cooling across Europe even as the planet warms overall, violent weather swings, and accelerated sea level rise along the US East Coast.
For Iceland specifically, a weakened AMOC could mean a substantial drop in temperatures, with knock-on effects for transport, food security, and daily life as we know it. As Halldór Björnsson put it in a recent interview: “If we were to stay under 1.5 degrees, we wouldn’t need to discuss AMOC. The problem arises as soon as we reach two degrees.”
A Broader Context
When glacial melting comes up in conversation, many people struggle to connect it to anything beyond the loss of scenery. But the AMOC depends on cold, salty, dense water sinking in the North Atlantic. As the Greenland ice sheet melts, enormous volumes of fresh water pour into the ocean and dilute that process. If the sinking weakens, the AMOC slows — and in the worst case, it stops.
When exactly that tipping point might be reached is still uncertain; estimates range from 2035 to several decades further out. The changes will not arrive overnight. But that gradual pace is not reassurance — it is a reason to act now, while action still changes the outcome. Every nation needs to hold to the Paris Agreement and do everything possible to keep warming below 1.5° Celsius. Moving away from fossil fuels is not optional for the communities that depend on a stable climate.
Two Types of Problems
At a seminar I attended at COP30, someone asked how progress is even possible when the scale of the challenge feels so overwhelming. One scientist offered a useful frame: problems divide into those that are still solvable and those that are not. We are still — just — in the first category. Constructive action can still prevent the irreversible tipping points from being triggered.
Another scientist at the same event pointed to the number of positive climate initiatives already underway, which was genuinely encouraging. What he lamented was the shortage of resources and coordinated planning needed to take full advantage of them. He was direct about the damage caused by misinformation and the importance of rebuilding trust in science — talking openly about what global warming could actually mean, rather than softening it.
None of what I have described here is comfortable reading. But we have to face it. Climate change is no longer a thought experiment. I think we owe it to future generations to say plainly what their world is up against — the way a doctor owes a patient an honest diagnosis, however hard that conversation is. The facts are what they are. What we do with them is still up to us.
In my next article, I will turn to the positive turning points that emerged at the UN climate conference in Brazil — the innovations, the governance shifts, and the legislative moves that are actually making a difference. There is more to say on the hopeful side of this story.
The author is a member of parliament for the Samfylking.
