Climate targets vs physical limits

I had the honor to join the World Economic Forum’s Radio Davos podcast together with Sumant Sinha to discuss where the climate science stands today, and how science, policy and business must come together. The science is clearer than ever: 1.5 degrees Celsius of global mean surface temperature rise is not a goal or aspiration, it is a physical limit. We need to take it very seriously. Yet, we do know that we are going to breach 1.5. In 2024, we experienced 1.5 degrees Celsius for the first time, even 1.55. It cost the global economy over US$200 billion in all the droughts, floods, heatwaves, fires, disease outbreaks. The best scenarios to solve the climate crisis still allow us to come back. It will take decades, and it means an overshoot period that we must keep as small as possible. Every tenth of a degree matters, because tiny changes in global averages translate into massive volatility and extremes at the local level. At the same time, we now have growing evidence that decarbonized, planetary-boundary aligned business models are not only sustainable, but also more profitable, competitive, and attractive for talent. This is the modern and resilient path forward. https://lnkd.in/eWUNxCTk

Following my recent posts on the failure of the 1.5°C pathway, more data has been released that sharpens the picture. The latest Global Carbon Project report confirms that the remaining carbon budget is now measured in years, not decades. The numbers are simple. And they are unforgiving. 📌 2025 emissions: ~42 Gt CO₂ 📌 1.5°C budget left: ~170 Gt CO₂ 📌 Time until budget exhausted at current pace: 4 years Even the 1.7°C pathway offers only limited room: ~525 Gt, about 12.5 years of today’s emissions. And the 2°C budget, while larger at ~1055 Gt, still represents only 25 years at current levels. This is what failure of 1.5°C looks like in engineering terms: we have already consumed most of the simplest pathways, and each additional tenth of a degree tightens the constraints on buildings, infrastructure, and energy systems. For the built environment, this means: • Outdoor conditions will continue to worsen • Cooling and heating loads will rise • System efficiency will decline • Operational drift will intensify • Retrofits must do more than compensate, they must over-compensate Decarbonisation is no longer a linear problem. It is now a race between physical limits and operational capability. At BAARCH | Building Analytics & Applied Research for Climate and Humans, this is already visible: chillers working harder, envelopes struggling under new extremes, HVAC plants pushed further from their optimal points. The carbon budget is not abstract. It is a boundary condition for engineering. 📌 We cannot negotiate with physics, we can only respond to it. 🔗 Follow Yann Defrance for grounded reflections where climate numbers meet system reality. ♻️ Like, comment, or share if you believe carbon budgets should inform every retrofit decision. Link to the source analysis: https://lnkd.in/g2aqRpUf #Decarbonisation #CarbonBudget #EnergyEfficiency #NetZero #ClimateChange #BuildingPerformance #HVAC #Retrofit #Commissioning #OperationalExcellence #Sustainability

A recent Comment in Nature Magazine argues we should drop the Paris Agreement’s 1.5°C limit and replace it with clean-energy targets. This would be the wrong thing to do. Why? 1) The 1.5°C temperature goal is not “meaningless” - it is the legal, political, scientific anchor for climate action - including dealing with overshoot. The authors claims temperature limits lack salience for decision makers and the public. But that does not reflect reality: 1.5°C has become the organizing benchmark for international, national and corporate policy, finance, and accountability. The authors’ call for a focus instead on clean energy targets has overlooked that targets were agreed at COP28 linked to 1.5°C: tripling renewables, doubling energy-efficiency by 2030, alongside the transition away from fossil fuels. 2) Imminent overshoot of 1.5oC is not an excuse to move the goalposts and declare the Paris temperature goal obsolete. The correct response is to use Paris 1.5oC limit to define clean energy benchmarks that limit the magnitude and duration overshoot—and drive warming back down as fast as possible. 3) Actionable targets for the clean energy transition matter but they need to be driven by the Paris Agreement's climate goals. In our new Highest Possible Ambition (HPA) scenario developed with colleagues at PIK - Potsdam Institute for Climate Impact Research we have confronted head on the implications of overshoot for energy (and other) targets. We use the Paris goals to quantify exactly what “energy transition at the necessary scale” looks like: global electricity generation quadruples with wind and solar supplying over 90% of 2050 electricity demand. Renewables capacity increases around 3.5-fold by 2030—ahead of the COP28 tripling goal. So yes— the world needs actionable benchmarks for the clean energy transition but it doesn't help to pretend that these can stand on their own without being anchored to delivering the Paris climate goals. Metrics and targets only protect people if they are calibrated to limiting warming and reducing risk. 4) On geoengineering: delay is the accelerant. The authors worry that 1.5°C justifies risky interventions like solar radiation modification. The uncomfortable truth is this: weak and delayed action by governments is what fuels the search for risky shortcuts, not 1.5C. We should deliver rapid emissions cuts, not abandon the Paris benchmark that defines what is “safe enough” and necessary for the clean energy transition. 5). We can still “rescue” 1.5°C—if we choose to. Our analysis shows how to minimize overshoot and return to well below 1.5°C by 2100 through conventional mitigation—starting now, with the highest possible ambition. 6)  Bottom line: Don’t confuse “hard and getting harder” with “obsolete.” The world doesn’t need permission to lower ambition. It needs governments to implement what they already agreed—at the speed and scale that 1.5°C demands. https://lnkd.in/gqTAFEZz

In conversations with sustainability leaders, I’ve noticed a recurring pattern: decarbonisation and net-zero targets dominate the agenda, while adaptation, i.e. preparing for the climate impacts already here, is often sidelined. But data suggests this is a costly oversight. A recent World Economic Forum–Boston Consulting Group (BCG) report warns that in a >3°C warming scenario, key sectors could see a 5–25% erosion in EBITDA by 2050. So, what does this actually look like in practice? 1. Food & Beverages Physical climate impacts are already hitting production and profits. - Brazil’s droughts (2014–2016) slashed coffee yields by 30%, spiked prices by 50%, and cost Nestlé nearly $1B. - In India, beverage firms spend over $1M annually on water tankers in Maharashtra alone, thanks to groundwater depletion—silent costs quietly eroding margins. 2. Utilities - In 2020, wildfires damaged 36 of Telstra’s cell towers in Australia, triggering millions in repair costs. - Singapore, prone to heavy monsoons, now has invested in flood-resilient infrastructure to keep energy systems running. Climate Risk = Sector + Location Two variables drive your climate risk exposure: the sector you operate in and where you operate. - Over 50% of global semiconductors production occurs in climate-vulnerable regions. A single flood in Taiwan or heatwave in Malaysia could stall entire tech or auto supply chains. A Roadmap to Assess Physical Climate Risk: ➡️ Physical assets: Are your factories, warehouses, or data centers located in floodplains, drought-prone, or heat-vulnerable zones? ➡️ Supply chains: Are key suppliers operating in regions facing water stress, extreme weather, or instability linked to climate migration? ➡️ Infrastructure resilience: Can your energy grids, transport routes, and IT systems withstand a 1-in-50-year climate event? ➡️ Financial exposure: What would a 20% spike in raw materials or a prolonged drought mean for your EBITDA? Adaptation isn't a separate agenda, it’s the lens that will help future-proofs your decarbonisation strategy. #climateresilience #climateadaptation #decarbonisation

Sad state of affairs but this needs to be said: it's noble and needed for companies to set 1.5° C aligned climate transition plans and #sustainability targets. That said, and I wish it weren't so, we need to be honest and realistic about the challenge at hand. Setting a 1.5° C climate target means you are committing to do *much* better than average, because average is completely failing us. 2023 was the warmest year ever recorded. 2024 is hotter. The rate of warming is accelerating. And we are not reducing total yearly global emissions. Global average temps for January-September 2024 reached 1.54° C (±0.13°C). That's already north of 1.5°. If you're setting a 1.5° C target as a company in 2024, it's a high bar to live up to and make happen. At the same time, it's the level of ambition we need. Separately, I suspect a lot of existing targets will be restated over the next 1-2 years due to CSRD assurance, but that's a separate story. While many standards providers and target-setting firms still anchor to 1.5° C, as business practitioners (and society), we need plans and scenarios for 2-3°, with the adaptation, investment, damage control, and resilience that's going to require. Above all, we need action that aligns to reality (not assumptions in a PDF), real feasibility understanding, and the guts to tell each other (and other leaders) the truth about what it's going to take to get there. Otherwise a climate target is just a dream or wishful thinking, not a roadmap from A to B