UNEP confirms 1.5°C overshoot, warns of disorderly transition

The world is now grappling with the near-certainty of temporarily exceeding the 1.5°C global warming target, a reality that shifts probabilities for investors and intensifies physical climate risks. This temporary overshoot, while challenging, does not signal the end of climate action; instead, it underscores the urgent need for accelerated decarbonisation and innovative solutions, particularly in abundant clean energy, to minimise its duration and impact.

Navigating the climate reality of a 1.5°C overshoot requires a fresh approach to energy. Fuse Energy is committed to providing homes with abundant, clean energy, helping you manage your usage and contribute to a more sustainable future. Click here to switch to Fuse Energy today.

What is 1.5°C global warming overshoot?

Defining the 1.5°C target and its significance

The 1.5°C global warming target, enshrined in the Paris Agreement, represents a critical threshold for limiting global temperature rise. This goal aims to prevent the most catastrophic and irreversible impacts of climate change, such as widespread ecosystem collapse, severe sea-level rise, and extreme weather events. It serves as a scientific and political benchmark for global climate action, guiding policies and investments towards a more sustainable future.

The concept of temporary temperature exceedance

A 1.5°C overshoot refers to a period where global average temperatures temporarily surpass the 1.5°C limit before eventually being brought back down. This is not a permanent failure to meet climate goals, but rather a temporary exceedance that requires aggressive mitigation efforts and carbon dioxide removal (CDR) technologies to reverse. The duration and magnitude of this overshoot are crucial; a shorter, shallower overshoot would lead to fewer severe impacts than a prolonged, deeper one.

Why 1.5°C overshoot is now considered inevitable

Scientific consensus increasingly points to the inevitability of a temporary 1.5°C overshoot.1 A recent United Nations Environment Programme (UNEP) report states, "Exceedance of 1.5°C is coming in the next few years". This assessment is echoed by leading climate scenario providers. Maurits van Joolingen, managing director for climate scenarios and sustainability at Ortec Finance, notes that "even with a huge, immediate and global step-up in ambition, it is still not technically feasible to reach 1.5°C" without overshoot. Willemijn Verdegaal, co-founder and chief product officer at Trex, adds that "the science had already shown that staying under 1.5°C was quite implausible". This shift in understanding means that climate models are now actively incorporating overshoot scenarios, acknowledging that past emissions have locked in a certain degree of warming.

The implications of a 1.5°C overshoot

Intensified physical climate risks and extreme weather

Exceeding the 1.5°C threshold, even temporarily, will lead to an intensification of physical climate risks. This includes more frequent and severe extreme weather events, such as heatwaves, droughts, floods, and storms. These events pose direct threats to human lives, infrastructure, and natural ecosystems. The severity of these impacts will be directly linked to how far temperatures rise above 1.5°C and for how long.

Economic and societal consequences of higher warming

The economic and societal consequences of higher warming are profound. Intensified physical risks translate into significant costs, including damage to property, disruption to supply chains, reduced agricultural yields, and increased healthcare burdens. Vulnerable communities, both in the UK and globally, will face disproportionate impacts, exacerbating existing inequalities. The need for adaptation measures will become more urgent, requiring substantial investment to protect communities and infrastructure.

The increased likelihood of a disorderly climate transition

The confirmed overshoot increases the likelihood of a disorderly climate transition. The UNEP's confirmation makes a disorderly transition more likely, experts warn. A disorderly transition is characterised by abrupt policy changes, market volatility, and stranded assets, as governments and industries react to escalating climate impacts. This contrasts with an orderly transition, which involves a gradual and planned shift to a low-carbon economy. Investors are now advised to focus on building resilience into their portfolios, recognising that higher warming scenarios are more probable and that the path to net-zero may be turbulent. Willemijn Verdegaal also warns that "All rapid change is likely to go hand in hand with high volatility".

Strategies for navigating and minimising 1.5°C overshoot

Accelerating emission reductions and fossil fuel phase-out

Minimising the duration and magnitude of the 1.5°C overshoot hinges on rapidly accelerating emission reductions. This means a swift and decisive phase-out of fossil fuels, coupled with a massive deployment of renewable energy sources. Stronger climate policies, international cooperation, and significant investment in clean technologies are essential to drive down emissions at the pace required. Every tonne of carbon dioxide avoided helps to limit the peak temperature and shorten the overshoot period.

The critical role of carbon dioxide removal technologies

Even with aggressive emission cuts, carbon dioxide removal (CDR) technologies will be critical for bringing global temperatures back down below 1.5°C after an overshoot. These technologies actively remove CO2 from the atmosphere, either through natural solutions like afforestation and enhanced soil carbon, or technological approaches such as direct air capture and bioenergy with carbon capture and storage (BECCS). Scaling up CDR will require substantial research, development, and deployment, alongside robust governance frameworks.

Building resilience to unavoidable climate change impacts

While mitigation and CDR aim to reduce future warming, building resilience is about adapting to the climate change impacts that are already unavoidable. This includes investing in robust infrastructure, developing early warning systems for extreme weather, improving water management, and protecting natural habitats. For UK adults, this means supporting local and national initiatives that strengthen communities against the physical realities of a changing climate.

Abundant clean energy: a power play against 1.5°C overshoot

Navigating the 1.5°C overshoot requires a fundamental shift in our energy paradigm. The traditional "use less" narrative, born from a scarcity mindset, is insufficient for the scale of the challenge. Instead, abundant clean energy emerges as the ultimate "power play" - a tangible, empowering solution that enables rapid decarbonisation and builds a resilient future.

Powering rapid decarbonisation and net-zero transition

Abundant clean energy is the engine for rapid decarbonisation. By providing a plentiful, affordable, and reliable supply of electricity from renewable sources, we can electrify transport, heat, and industry at an unprecedented pace. This shift is not about rationing but about empowering homes with the energy they need to thrive, without the carbon footprint. It accelerates the net-zero transition by replacing fossil fuels with a sustainable alternative, driving down emissions across all sectors. The average UK home uses around 2,500 kWh of electricity per year, a baseline that highlights the sheer scale of clean energy generation required to power a fully decarbonised society.

Enabling large-scale carbon removal solutions

The deployment of large-scale carbon removal technologies, essential for returning below 1.5°C, is highly energy-intensive. Abundant clean energy provides the necessary power for these processes, making them economically viable and environmentally sustainable. Whether it's powering direct air capture facilities or supporting the energy demands of bioenergy with carbon capture, a surplus of clean energy is fundamental to scaling these critical solutions. Without it, the energy required for CDR would simply shift the emissions problem elsewhere.

Building a resilient future with power to play with

A future powered by abundant clean energy is one where society has "power to play with". This challenges the scarcity consensus, offering a vision where energy is no longer a constraint but an enabler. It means homes can be heated comfortably, electric vehicles can be charged affordably, and households can innovate without the constant worry of energy costs or environmental impact. This abundance fosters resilience, allowing communities to withstand climate shocks and rebuild quickly, while also providing the capacity for ongoing innovation in climate solutions. It's a shift from fear and limitation to capability and opportunity, empowering individuals and society to actively shape a more sustainable world.

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References

1. Net Zero Investor. Brace for impact: climate scenario models grapple with 1.5°C overshoot