How Small Island Nations Secured the 1.5°C Target That Shapes Global Climate Policy

How Small Island Nations Secured the 1.5°C Target That Shapes Global Climate Policy

By
Drew Campbell

Publish Date:November 17, 2025

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📰 The quick summary: The Alliance of Small Island States has successfully shaped major climate agreements including the Paris Agreement's 1.5°C target, demonstrating how vulnerable nations can effectively influence global climate policy.
📈 One key stat: The Alliance represents 39 small island and low-lying coastal states across five regions, allowing these vulnerable nations to collectively amplify their voice in international climate negotiations.
💬 One key quote: "One-point-five to stay alive" became the rallying cry of the small island nations: and it was having an impact.

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1️⃣ The big picture: Small island nations have formed a powerful alliance that punches above its weight in global climate diplomacy. The Alliance of Small Island States (AOSIS), representing 39 vulnerable countries, has achieved remarkable influence despite having no permanent secretariat or formal charter. Their advocacy secured the critical 1.5°C temperature limit in the Paris Agreement, which wasn’t guaranteed when negotiations began. Through strategic cooperation and pooled resources, these nations have established themselves as the moral voice in climate talks, pushing larger countries toward more ambitious climate action.

2️⃣ Why is this good news: Small, vulnerable nations have found a way to effectively counter the political dominance of larger, wealthier countries in climate negotiations. Their collaborative approach demonstrates how shared interests can overcome resource limitations in international diplomacy. AOSIS has secured concrete wins including representation on key climate bodies, establishment of the loss and damage fund, and the inclusion of the 1.5°C target that guides global climate action. Their influence has expanded beyond UN talks into international law, with the International Court of Justice recently confirming legal obligations for states to reduce emissions and protect people from climate impacts.

3️⃣ What’s next: At COP30 in Brazil, AOSIS plans to leverage the recent ICJ ruling to demand stronger emission reduction commitments from countries. The alliance will push for clearer targets on climate adaptation and call for developed nations to triple public climate finance by 2035. Island nations have made it clear they won't agree to any consensus that compromises their survival.

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Read the full story here: The Conversation – Why small climate-vulnerable island states punch well above their weight in UN climate talks

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