Human activity is pushing Earth beyond safe planetary limits, raising the risk of climate breakdown, ecological collapse and systemic global failure.

The greatest threat facing humanity is not oil prices or even regional war. It is the destabilisation of the entire Earth System which sustains all life on this planet, our own included.

Such is the warning contained in the Global Challenges Foundation’s 2026 report on Catastrophic Risks.

While the world remains entranced by oil prices and small wars, global media and most governments are turning a blind eye to the real threat to our future.

The Foundation has been a voice of caution and wisdom since its first report in 2012. This year its focus is on five specific risks: catastrophic climate change; ecological collapse; weapons of mass destruction; risky military use of artificial intelligence; and near-Earth asteroids.

Commenting on the overall problem, Fatima Denton and Johan Rockstrom (p7) state: “The systems we build now will decide whether Earth remains habitable.

“We are pushing the planet beyond the limits of a safe operating space with more than three-quarters of the Earth’s support systems outside the safe zone. The latest scientific assessment shows that seven of the nine planetary boundaries have now been breached, with the ocean acidification boundary most recently breached.”

In short, we are already building an uninhabitable Earth for our children – and had better change our ways. Fast.

Climate

“Every year in the past decade (2015–2024) has ranked among the warmest on record,” it reports. “The long-term trend is unmistakable: the planet is warming at an accelerating pace.

“The risk lies not only in continued warming but in cascading disruptions that could move the climate beyond humans’ ability to adapt and manage it.”

Sea-level rise, crop failures and extreme heat will render many regions uninhabitable and trigger mass population shifts. Ecosystem collapse will wreck food, water and climate regulation.

Measures to prevent climate catastrophe are far too few, and far too late.

Nature collapse

There is a fragile balance between human demand and the ability of the Earth’s ecosystems to supply it. When human pressure exceeds this, “soil fertility, freshwater supplies and biodiversity can collapse and severely undermine agriculture and the habitability of large regions on Earth”.

Human activities such as the burning of fossil fuels and resource exploitation by farming, mining and forestry are severely degrading ecosystems worldwide.

While over 100 countries incorporate biodiversity values in their regulations and there is growing recognition from business and banking of their importance “the pace of progress remains too slow compared to the speed of … environmental decline.”

Prioritising ecological risk over economic interests will be necessary to prevent ecological collapse, says IPBES chair David Obura.

Weapons of mass destruction

Hostile geopolitical relations and deteriorating strategic conditions are eroding the rules that prevent the world from destroying itself with weapons of mass destruction.

After three decades of shrinkage, the global nuclear stockpile of 12,241 warheads – sufficient to wipe out humanity five times over – is showing signs of fresh expansion as countries re-arm, and new nuclear players emerge. New technologies are making nuclear weapons more dangerous and far-reaching than ever. Countries are setting more relaxed rules for the use of nukes. Leaders are ramping up their nuclear threat rhetoric.

Among the most alarming new possibilities is for nuclear war to break out as a result of disinformation – fake news generated with AI – published on the Internet. The spread of warfare into world financial systems, resources like water or strategic minerals, also escalates the nuclear threat. Governments are ill-equipped to meet these new threats.

Military use of AI

Artificial intelligence has introduced a volatile new element into global conflict risk. As militaries compete for the technological high ground in a new arms race, they are adopting technologies whose risks, flaws and drawbacks are poorly understood. Humans are handing to computers the power to make life and death decisions for millions. Those decisions can be taken at lightspeed, “beyond human comprehension.”

“The risk is that accidental escalation could happen if systems fail, do not know how to respond in interactions or changing circumstances, or are hacked. As a result, AI integration raises the likelihood of miscalculation and misperception between adversaries,” says the GCF. Furthermore AI is not constrained by human laws, moral values or accountability. It is a “black box”.

AI is already out of control in the civilian world, and its military uptake multiplies the likelihood of a catastrophic outcome. The absence of a world body to oversee use and governance of AI systems, both civil and military, is a crucial oversight.

Approaching asteroids

With all the other man-made megathreats, asteroids might seem the least of our worries. And indeed, they are a far more remote, though equally devastating event.

Astronomers have so far logged 11,000 large asteroids that pass sufficiently close to Earth to strike it.

An asteroid of several hundred metres in size is the equivalent of detonating the world’s entire atomic arsenal. There is, at present, no way to prevent such an impact – through we might well detect it in advance. For that, global co-operation is required, which does not now exist.

The bottom line of the 2026 GFC report is that humanity is utterly unprepared to deal with any of the catastrophic risks explored in its report. We haven’t the institutions, the will, the co-operation or the understanding of the nature and scale of a systemic risk such as this.

“We treat each of these crises as if it were separate: one agency for forests, another for oceans, a third for emissions. Yet the Earth system moves as a whole,” it points out. Complicating matters, every government sees the problem differently, making the task of developing solutions even more difficult.

“At the same time, rising geopolitical tensions, resurgent nationalism and vested interests drive competition and unilateral action instead of cooperation. Our collective capacity to mitigate global catastrophic risks and protect both people and planet remains weak at best.”

The GCF report is an invaluable contribution to the ongoing discussion of how humanity can escape the trap it has dug for itself – and the obstacles to that. However, it omits to deal with at least five of the ten catastrophic threats identified by the Council for the Human Future. – overconsumption of resources, global poisoning, overpopulation, pandemic disease, and disinformation.

These too must be solved through mechanisms such as an Earth System Treaty and a global plan of action for saving humanity on a habitable planet.