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The incoming Brazilian Presidency of COP30 has released its second letter to the international community, calling for urgent and collective climate action. With 2024 confirmed as the warmest year on record and CO₂ levels at an 800,000-year high, the letter moves from vision to action. At the heart of this call is the launch of the Global Mutirão —a worldwide, self-organized mobilization encouraging concrete, grassroots climate solutions. Everyone, from governments to communit