Why is 1.5°C so important?

The 1.5°C target from the Paris Agreement represents a critical threshold in global climate efforts, particularly as we look ahead to COP29 and beyond. The focus on limiting global warming to 1.5°C above pre-industrial levels is not arbitrary—it is rooted in scientific evidence and aimed at preventing the most catastrophic impacts of climate change.

Why is 1.5°C so important?

The world has already warmed by about 1.1°C, and we’re witnessing more frequent and severe climate-related disasters such as wildfires, droughts, hurricanes, and floods. At the core of the 1.5°C target is the idea that each fraction of a degree matters. The Intergovernmental Panel on Climate Change (IPCC) has shown that the difference between 1.5°C and 2°C warming can drastically alter the intensity and frequency of extreme events, food security, biodiversity, and even the habitability of certain regions.

If global temperatures were to rise beyond 1.5°C, the world could face:

• More extreme heatwaves: Unprecedented heat extremes will become more frequent, threatening human health and exacerbating the urban heat island effect in cities.
• Loss of ecosystems: Coral reefs, which are crucial for marine life, will experience massive die-offs, and biodiversity will sharply decline, impacting food chains and natural systems that humans rely on.
• Sea level rise: Rising seas could displace millions of people living in coastal areas and small island nations, leading to large-scale migration and economic loss.
• Food insecurity: Higher temperatures and changing precipitation patterns can diminish crop yields and disrupt global food supplies, worsening hunger, and poverty, especially in vulnerable communities.

Why isn’t 2°C enough?

Many assume that a difference of just 0.5°C is minimal, but studies reveal the opposite. A 2°C rise in temperature would lead to more than double the impact compared to 1.5°C:

• Droughts and wildfires: Increasing temperature by another half-degree would mean more severe and widespread droughts, and wildfires would become more intense and destructive, threatening both people and nature.
• Extinction risks: The risk of species extinction rises exponentially with higher temperatures, putting stress on ecosystems and diminishing biodiversity that is vital for food, medicine, and natural resources.

What’s the urgency?

If current trends continue and emissions remain uncurbed, the world is on track for warming of up to 3°C or more by the end of the century, according to the UN Environment Programme’s 2023 Emissions Gap Report. Such a scenario would result in uncontrollable climate disruptions, including mass displacement of populations, collapse of ecosystems, and profound economic and societal losses.

Human societies are part of the planet, not the other way around

The urgency to act is compounded by the fact that humans are deeply intertwined with the natural systems that support life on Earth. Climate change does not only affect the environment—it impacts global economies, health systems, and even political stability. By ignoring this, we risk undermining the very foundations of human society. The planet will endure, but human societies may not, unless we realign our actions and priorities with the health of the Earth.

As we head into crucial climate negotiations, it’s clear that every tenth of a degree matters. 1.5°C is more than just a number—it’s a line between a world where adaptation is still possible and a future where the challenges become insurmountable.

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