CLIMATE change’s specter looms larger than ever, casting a shadow over ecosystems, economies and human lives globally. Within this daunting reality, the 1.5 degrees Celcius limit set by the Paris Agreement stands as a critical threshold for avoiding the most catastrophic consequences. A June 2025 Germanwatch policy brief, “1.5 C to stay alive,” underscores urgent adherence to this limit and charts a practical course for navigating this challenge.
The report’s findings are stark. The world is already experiencing the impacts of a mere 1.1 C of warming above preindustrial levels, manifested in more frequent and intense extreme weather events, sea-level rise and biodiversity loss. Germanwatch notes that 2024 marked the “first year the 1.5 C limit was exceeded.” While the Paris Agreement references a long-term average, that year served as the accelerating climate crisis’ “red warning signal.”
The ramifications of exceeding 1.5 C are far-reaching. Every 10th of a degree of additional warming intensifies risks to human safety and the environment. Vulnerable regions like small island states and coastal areas face severe consequences for water and food supplies. Globally, biodiversity is under increasing threat, with the potential for extreme waves of extinction.
Germanwatch paints a grim picture of a world where global warming progresses unchecked. The trigger of tipping points could lead to irreversible processes like ice sheets’ collapse, coral reefs’ loss and permafrost’s widespread melting. These effects could further accelerate global warming, rendering parts of the planet uninhabitable and endangering human civilization.
Despite the urgency, the report affirms that adhering to the 1.5 C limit is still technically possible — though it is becoming increasingly unlikely given current political trajectories. This possibility hinges on two core elements: aggressively reducing global greenhouse gas emissions to net-zero; and deploying additional measures to ensure any temporary overshoot is minimized.
These efforts’ linchpin is a rapid, equitable transition away from fossil fuels. Germanwatch advocates for accelerating the expansion of renewable energy (RE) sources (solar, wind, hydropower) and drastically improving energy efficiency. Policymakers must protect and promote natural carbon sinks essential for absorbing carbon dioxide from the atmosphere: forests, moors and salt marshes.
The report acknowledges the need for additional measures to address residual emissions from sectors like industry, aviation and animal husbandry. Carbon capture and storage technologies offer one potential pathway, though Germanwatch emphasizes that their deployment should be limited to situations where no other emissions reductions options exist.
A narrowing window
Given these uncertainties, Germanwatch underscores the importance of prioritizing emissions reductions to the greatest extent possible. As global emissions have plateaued rather than decreased, the window for achieving the 1.5 C target is narrowing rapidly.
According to the report, the 1.5 C limit extends beyond a mere technical target. It is a “political, social and economic guardrail.” It serves as a benchmark for global climate policy, informing national and international climate mitigation efforts. It orients economic players, providing guidelines for transition plans, investments and innovations.
The 1.5 C limit is socially unifying, offering a common basis for climate mitigation movements and promoting public awareness. Courts are increasingly invoking the 1.5 C limit in climate lawsuits, holding governments accountable for adhering to climate targets.
On the global stage, the report notes that the Paris Agreement legally binds signatory parties to limit global warming, making the 1.5 C limit an obligation under international law. In this context, the climate crisis’ burden must be shared fairly, particularly between countries that are disproportionately responsible for greenhouse gas emissions.
Climate change exacerbates social inequalities, increases the risk of conflict and threatens vulnerable populations. Sticking to the 1.5 C limit safeguards human rights, human security and global livelihoods. Failing to adhere to it could undermine faith in multilateral processes, leading to further instability and undermining the global system.
The report’s conclusion is unequivocal: to realize the 1.5 C limit, “we have to act now!” Key measures include drastically reducing global greenhouse gas emissions, phasing out fossil fuels, accelerating RE adoption and adapting to unavoidable climate impacts. Countries must submit enhanced Nationally Determined Contributions to the Paris Agreement, with ambitious 2030 and 2035 targets. The report calls for concrete policy measures and clear pathways from all sectors to achieve these goals.
The first Global Stocktake (GST) conclusions at the end of 2023 revealed that climate protection efforts were insufficient. Germanwatch urges signatory parties to act upon the GST’s conclusions, including tripling RE capacity and doubling energy efficiency by 2030.
International climate finance must be adapted to the needs of developing countries, providing sufficient resources for emissions reductions, adaptation, and addressing loss and damage. In a complex geopolitical landscape, maintaining multilateralism and international cooperation is paramount for effective climate action.
The report underscores the urgency of adhering to the 1.5 C limit. This necessitates decisive action across all sectors and at all levels of governance. By implementing ambitious measures to reduce emissions, promote sustainability and foster global cooperation, we can chart a course toward a more resilient, equitable future. Our failure risks jeopardizing the planet’s ecosystems, human livelihoods and our world’s stability.
The author is the founder and chief strategic advisor of the Young Environmental Forum and a subject-matter expert at the Co-operative College of the Philippines. He completed a climate change and development course at the University of East Anglia (UK) and an executive program on sustainability leadership at Yale University (USA). You can email him at ludwig.federigan@gmail.com.
Be the first to comment