We are on the edge of irreversible climate change

As global attention turns towards COP30, to be held in Brazil between 10 November and 21 November 2025, the Global Tipping Points Report 2025 has sounded a clarion call about the escalating risk of irreversible environmental and societal change.

In climate change, tipping points are critical thresholds in the Earth’s systems, such as ice sheets, forests, or ocean currents, beyond which small changes can trigger large, often irreversible, and self-perpetuating shifts in the climate.

Compiled by 160 experts from 23 countries and 87 institutions, the report underscores that many Earth systems are perilously close to, or already past, tipping points.

For South Africa and the broader African continent, the implications are stark. While much of the world’s carbon emissions originate elsewhere, Africa stands disproportionately vulnerable.

Weak infrastructure, limited finance, high poverty rates and long histories of colonial and post-colonial underinvestment in public utilities combine to make the continent more sensitive to the cascading effects of climate instability.

The latest findings suggest that without urgent, large-scale intervention, crucial gains made in sustainable development, health, food security and poverty alleviation are at serious risk.

Some core messages from the report are especially consequential for Africa:

• we are already passing tipping points. The report finds that warm-water coral reefs are now undergoing widespread, irreversible dieback. For Africa, these ecosystems are not only sources of food and income but natural barriers against storms and sea surges. Their loss will amplify instability, especially in low-lying coastal zones.

• Overshoot of 1.5°C increase in temperature is no longer a distant possibility, with warming projected to exceed that threshold, risks of more tipping points become significant. For Africa, the risk is not only environmental but also socio-economic. Agriculture, water supplies, disease vectors, and infrastructure are all sensitive to even small changes in temperature and precipitation.

• Local non-climate stresses amplify vulnerability. The report emphasises that climate change isn’t the only threat. Land degradation, pollution, unsustainable resource extraction, loss of biodiversity, overfishing, deforestation – each erode systems’ ability to cope. In Africa, many of these are already high on the list of challenges.

• Positive tipping points are already underway. Adoption (solar, wind), electric vehicles, battery storage, heat pumps, and demand-side shifts are starting to self-reinforce, although they need acceleration. For Africa, where energy deficits are acute and the potential for renewables is large, this is a critical lever.

Why it matters for South Africa

South Africa is in many respects a microcosm of both the opportunities and hazards facing the continent of Africa.

South Africa relies heavily on coal-fired electrical power and has amongst the more developed energy infrastructure on the continent but also faces severe reliability and pollution challenges.

The report’s insistence that emissions be halved by 2030 compared to 2010 levels, net zero by 2050, along with rapid scaling in renewables, implies big transitions for South Africa’s power system.

Delaying could not only lock in more emissions and environmental damage but could also lead to economic and social costs in health and lost agriculture yields.

Coral reefs, river systems, biodiversity hotspots, and even mountain glaciers in Southern Africa are under strain. Loss of biodiversity has direct implications for tourism, agriculture, and water security.

Many communities depend on natural systems that are less resilient to shocks, from droughts to floods. Once thresholds are crossed, recovery may be very difficult, if not impossible.

South Africa already has high levels of poverty, inequality, and high unemployment. Disruptions in food systems, water supply, and health services, which are affected by climate change, will hit vulnerable populations hardest.

The report makes the case that climate action must be just, meaning social protections, participatory governance, and finance must support the vulnerable poor.

The report urges that binding policies and mandates for clean technologies become central. For example, justice-based approaches, and rethinking finance, especially lowering the cost of capital for the Global South.

For South Africa, that suggests not just adopting more renewables, but integrating climate risk in planning, policy and budgeting.

Pathways forward

The Global Tipping Points Report doesn’t leave us without hope. It outlines several levers for action, many of which are particularly relevant for African states and civil society.

Every fraction of a degree and every year over 1.5°C counts, both globally and for Africa. Each country prepares and submits Nationally Determined Commitments (NDCs) to the United Nations Framework Convention on Climate Change periodically.

These commitments should contain more ambitious mitigation plans, fast phasing out of coal, and curbing methane emissions.

Policies that make clean energy technologies cheaper, accessible, and reliable should be fast-tracked, and investment in green infrastructure, such as renewables and battery storage, should be accelerated.

Encouraging behaviour change, waste reduction, and shifting diets should also be made a priority in efforts to address the climate crisis. These can ripple across sectors and produce reinforcing benefits.

Ensuring that climate action is fair, participatory, and protects the rights and livelihoods of vulnerable populations is vital.

Tipping point awareness should be embedded into national planning, climate risk assessments, and infrastructure design. Financing structures should be reformed so that access to climate finance is not biased against countries already facing high risk.

Even as the world works to curb emissions, local efforts to restore degraded land, protect biodiversity, manage forests sustainably, reduce pollution and overfishing all help shore up resilience. For many African countries, this is where immediate gains can be made.

The Global Tipping Points Report 2025 brings forward both a warning and an opportunity. For South Africa and Africa, the warning is that delay or weak action will not just mean incremental harms, it could mean crossing thresholds that lead to irreversible damage.

There is also an opportunity in that some of the transformative change required is already within reach: deploying renewables, strengthening ecosystems, adopting just, inclusive governance, and shifting finance.

What this report makes clear is that the stakes are no longer academic. They are existential for nature, economies and societies.

For Africa, already carrying much of the burden of climate change with fewer resources, the urgency is especially high. COP30 and national policy fora must seize this moment: not just to talk, but to act decisively.

• Dr Enock Sithole is the executive director of the South Africa-based Institute for Climate Change Communication.