Half a Degree Worth of Change: Revisiting the 1.5°C Target at COP31

Ever sat in a room that already feels comfortable and nudged the heater up by just half a degree? You probably didn’t notice much of a difference — maybe just a faint sense that the air felt slightly warmer. But when it comes to Earth, that same small increase doesn’t go unnoticed. If the planet’s natural “heater” turns up by even half a degree, the effects don’t stay subtle — they ripple through weather, land, oceans, and everyday life around the world.

Preventing the turning up of the heat of the Earth is precisely why COP31 is taking place.

What is COP and Where Will COP31 Be Held?

Every year, the world’s nations come together under the United Nations Framework Convention on Climate Change (UNFCCC) to negotiate how to address global warming. These gatherings are called the Conference of the Parties (COP) — the highest decision-making body responsible for assessing progress and setting collective climate goals (UNFCCC – What is COP?). COP meetings also oversee related agreements like the Kyoto Protocol and the Paris Agreement (UNFCCC – The Paris Agreement).

The next summit, COP31, will take place in Antalya, Türkiye, from 9 to 20 November 2026 with the country’s climate minister as the president of the summit while Australia leads the negotiations under a co-leadership structure agreed during diplomatic discussions (UN Climate Change – COP31 Host Announcement).

Introducing the 1.5°C Target

The 1.5°C target originates from the Paris Agreement, adopted at COP21 in 2015. The treaty’s goal is to hold the increase in global average temperature “well below 2°C above pre-industrial levels” and pursue efforts to limit warming to 1.5°C (Paris Agreement, Article 2 – UNFCCC). This more ambitious benchmark reflects scientific consensus that staying within 1.5°C substantially reduces the worst impacts of climate change compared to higher levels of warming (IPCC Special Report on Global Warming of 1.5°C).

Scientifically, a 1.5°C threshold means avoiding extreme heatwaves, sea level rise, and ecological collapse that become more severe beyond that point. However, without immediate and drastic cuts in greenhouse gas emissions, the world is likely to exceed this limit before 2030 or even as early as this decade (IPCC AR6 Synthesis Report).

Why the Target Needs to Be Revisited Now?

The reason the 1.5°C target must be revisited is because during COP30 in Belém, Brazil, it was found that while climate finance and adaptation frameworks were advanced, explicit commitments to phasing out fossil fuels — the main driver of greenhouse gas emissions — were still missing from final texts, leaving implementation momentum unclear heading into COP31 (UN Climate Change – COP30 Outcomes).

Why It Matters for the World?

Revisiting the 1.5°C target at COP31 is not just a technical exercise — it’s a global accountability moment. In simple words, revisiting the 1.5°C target at COP31 means checking whether countries’ updated climate plans for 2030 and beyond are robust enough to bend the emissions curve back toward a safer pathway.

This is critical because failing to do so raises the spectre of more frequent climate disasters, ecosystem collapse, and rising human suffering in vulnerable regions (IPCC AR6 – Impacts, Adaptation and Vulnerability).

What Does Crossing 1.5°C Mean?

When scientists talk about exceeding 1.5°C of global warming, they’re not talking about a summer where you’d sweat a little more. They’re talking about changes that directly affect where people can live, what food costs, how often disasters would happen, and whether the Earth remains entirely habitable (IPCC AR6 – Human Systems Impacts).

For everyday life, this could look like more days where it’s too hot to work safely outdoors, higher electricity bills due to constant cooling, food prices rising because crops fail, and homes becoming uninsurable due to floods or wildfires (IPCC AR6 – Human Health and Livelihoods).

Geographically, the low-lying nations could dissolve into water. According to the IPCC, even at 1.5°C of warming, countries like Maldives’ sea levels are expected to rise enough this century to flood large parts of these islands, contaminate freshwater supplies, and force communities to relocate (IPCC – Small Island Developing States). Countries like Bangladesh, with higher sea levels and stronger storms, millions of people could be displaced, would undergo one of the largest climate-migration crises in history while coastal cities like Miami, Jakarta, Venice, and Mumbai flood more often, even without storms, simply due to higher sea levels (World Bank – Groundswell Climate Migration Report; NASA – Sea Level Change).

At higher temperatures, massive ice bodies begin to destabilize. The Greenland Ice Sheet alone holds enough ice to raise global sea levels by over 7 meters if fully melted. While that wouldn’t happen overnight, scientists warn that exceeding 1.5°C increases the risk of irreversible melting tipping points (NASA – Greenland Ice Sheet; IPCC – Climate Tipping Points).

Why is 1.5°C the Target Precisely?

The difference between crossing 1.5°C and 2°C may seem quite insignificant numerically but the difference in their results scientifically is starkly concerning. According to the IPCC, crossing 2°C instead of staying near 1.5°C would expose hundreds of millions more people to climate-related risks, double the number of people affected by extreme heat and cause far greater losses of coral reefs, fisheries, and ecosystems (IPCC SR1.5 – Impacts Comparison).

In layman terms, the target to stay below 1.5°C doesn’t mean completely skipping out on climate change — it simply means avoiding the worst version of it possibly.

Hence, revisiting the 1.5°C target at COP31 isn’t just about climate activism or political ideology — it’s about maintaining the Earth as a habitable place ideal for everyday life while trying to make it a better place, half a degree at a time.