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The document examines climate change as a global challenge characterized by scientific uncertainty and long-term impacts. It frames the issue as a 'market failure' resulting from negative externalities, where the costs of greenhouse gas emissions are not internalized. The authors discuss the economic costs of mitigation versus inaction, the ethical implications of discount rates and inter-generational equity, and the potential for 'carbon leakage' in international trade. It emphasizes the necessity of combining mitigation and adaptation strategies, the critical role of R&D and technology transfer to developing nations, and the importance of international agreements like the Kyoto Protocol and the 2009 Copenhagen Summit (CoP 15).

The report documents the environmental and social history of the Betolaza, Circunvalación, and Uretamendi neighborhoods in Bilbao. It highlights how residents historically organized to combat recurrent forest fires through the creation of vegetable gardens, managed their own water distribution systems over 12 years, and supported each other during major floods in 1977-78 and 1983. The text describes the deep connection between the community and the surrounding Arraiz and Pagasarri mountains, as well as the loss of urban gardens in Uretamendi due to municipal landscaping. This work is part of the IntegrateNbS project (2024-2026), which aims to implement inclusive nature-based solutions for climate change adaptation and social equity.

The document presents a portfolio of BC3's urban research, focusing on the socio-economic and ecological implications of climate change. Key studies include an analysis of Bilbao's Sustainable Energy Action Plan, flood-risk assessments in Bilbao, Zurich, and Zaragoza, and the evaluation of heat-health warning systems and green roofs in Madrid.