Change NOW: +1.5°C, a critical climate threshold with profound impacts on polar regions
We often talk about +1.5°C as a critical threshold in global warming. But that global figure hides a much harsher reality: in the Arctic, it translates to roughly +6°C.
On the occasion of the ChangeNOW summit, Christian Lim, Managing Director of the SWEN Blue Ocean strategy, took part in a panel dedicated to the critical role of oceans and polar regions in the face of climate change. The discussions highlighted a reality that is often underestimated: although located at the far ends of the Earth, the poles lie at the very heart of the global climate system.
The Poles: Invisible Pillars of the Global Climate
Three key mechanisms highlight their essential role:
- Albedo, the planet’s mirror : Ice and snow reflect up to 80% of incoming sunlight. When they melt, darker surfaces are exposed, absorbing heat and accelerating warming.
- Thermohaline circulation, the ocean’s engine : The poles help drive the global ocean “conveyor belt,” redistributing warm tropical waters across the planet. Without it, regional climates would be dramatically altered.
- Permafrost, a carbon time bomb : Frozen soils store about twice as much carbon as is currently in the atmosphere. As they thaw, they release CO, and methane, a far more powerful greenhouse gas.
At 1.5°C, the West Antarctic Ice Sheet and Greenland pass irreversible melt thresholds. At 2°C, permafrost releases methane (30× more potent than CO₂), and the AMOC risks collapse.
If These Systems Tip…
- Northern UK and Norway could face, 40°C cold snaps; the Baltic could freeze.
- Cities like Jakarta, Bangkok, Miam, and later NY, Shanghai, Lago, would be underwater.
- The Amazon may shift to savannah; African and Indian monsoons could destabilize.
1.5°C is likely already crossed. 2°C is expected around 2050
The poles also host extraordinary biodiversit, from giant sea spiders to Antarctic krill, the planet’s largest biomass and the base of global food webs—now threatened by warming and overfishing.
What Can We Do?
- Above all: cut global emissions, everywhere.
- Establish marine protected areas.
- Explore localized ways to slow ice loss (e.g., reducing sea‑ice export), assessed by Ocean Visions.
- Develop alternatives to krill, such as microalgae‑based omega‑3s and astaxanthin (MiAlgae).
- Deploy satellites, biodiversity sensors (NatureMetrics) and AI tools to monitor and protect the regions.
The 1000 Ocean Startups coalition, now celebrating its 5th anniversary, has already supported 850+ solutions, from tidal energy to wind propulsion and krill alternative, reshaping our ability to safeguard the poles.
