2 December 2025. This is a thought leadership piece written by Cristina Gamboa, CEO, WorldGBC.
The UN Climate Summit COP30 concluded on 21 November 2025 with the “Global Mutirão” package — a deal designed to bridge some of the most contentious divides after two weeks of intense negotiations. Brazil had framed this as the COP of both “truth” and “implementation,” a test of multilateralism. Yet the talks revealed deep divisions, particularly on phasing out fossil fuels, underscoring the challenge of aligning ambition with delivery.
COP30 in Belém, Brazil, was a stark reminder of the real-time impacts of climate change. Scorching heat, torrential downpours, and flooding tested the resilience of delegates, volunteers, and the people of Belém day after day.
Despite these challenges, the city welcomed us warmly and participation was unprecedented — 56,000 delegates and 193 country representatives plus the EU gathered, making this one of the largest COPs in history.
This was a COP where protest was permitted and voices were heard. The arrival of a flotilla of indigenous communities from across the Amazon was a living metaphor for inclusion, justice, and the power of those too often left out of the conversation.
As Johan Rockström, Director of the Potsdam Institute for Climate Impact Research reminded us: “The global curve of greenhouse gas emissions needs to bend next year, 2026, not sometime in the future. We need to start, now, to reduce CO2 emissions from fossil-fuels, by at least 5% per year. This must happen in order to have a chance to avoid unmanageable and extremely costly climate impacts affecting all people in the world.”
President Lula championed the development of roadmaps to transition away from fossil fuels and tackle deforestation at the world leaders’ meetings. The World Green Building Council (WorldGBC) team arrived at COP30 with hope. And while the final outcomes showed only incremental progress, we remain optimistic about new developments like the Global Action Agenda. This framework offers a clearer blueprint for implementation — one which WorldGBC is contributing to and that the private sector and civil society are ready to step up and deliver on.
Despite the tensions in climate diplomacy, one thing is clear — the energy transition is happening. As Simon Stiell, UNFCCC Executive Secretary, put it: “the economics of the energy transition [the transition to renewable energy] are inevitable and already underway” With solar and wind now the lowest-cost sources of power in 90% of the world, accelerating investment in clean energy and infrastructure is in every country’s self-interest — otherwise they risk loss in competitiveness, rising energy costs, and losing out on energy security.
Buildings are on the frontline of this transition. They shape how we use energy and can support renewable energy production and provide demand signals for industrial decarbonisation. They also define how we adapt to climate impacts, and how we deliver resilience for communities worldwide.
This was recognised in the Global Climate Action Agenda — a five-year framework designed by the High-Level Climate Champions, and endorsed by the UNFCCC and the COP30 Presidency, to accelerate climate implementation and connect solutions from Parties (nations) and non-Party stakeholders.
I was gratified that buildings were at the forefront of both energy efficiency and resilience conversations at this COP. This matters because the built environment is no longer a side note — it is now firmly recognised as central to the new clean and green economy, thanks to the tireless advocacy efforts of the Green Building Council community and leaders from the global sustainable and decarbonised building movement.
At COP30, WorldGBC didn’t just participate — we showed up with climate and sustainability solutions. As an official observer to the UNFCCC process, our mission was clear: ensure the built environment and the businesses at the heart of transforming the sector are heard and recognised as essential to climate progress.
WorldGBC’s COP delegates spoke at 18 different events, representing our network of 85+ Green Building Councils and 53,000 members, proving that sustainable, climate-resilient buildings are not only possible — they are profitable, scalable, and essential for thriving economies.
A particular highlight for me was the session on “Financing Resilient Built Environments: Solutions for Infrastructure, Housing and Informal Settlements”. At this UNFCCC official side event, I made the case for scaling finance to build resilient housing and achieve justice and equity for vulnerable communities and informal settlements.
It was an emotional moment for me. I reflected how, in my home country, Colombia, decades of conflict plus climate change have displaced more than 8 million people, many rebuilding their lives in self-built housing. So, for me the lesson is clear, from Bogotá to the Amazon: resilience depends as much on social and financial inclusion as on physical infrastructure.
Another highlight was WorldGBC’s announcement of the expansion of our Building the Transition programme to accelerate national decarbonisation and resilience roadmaps across Africa and Asia-Pacific — two regions critical for global climate progress. These roadmaps, developed in collaboration with UNEP’s Global Alliance for Buildings and Construction (GlobalABC), empower national coalitions of Green Building Councils and stakeholders to convert ambition into projects and region-specific action.
Our initiative, supported by GlobalABC, Habitat for Humanity and WRI, was chosen by the COP Presidency as one of the official Plans to Accelerate Solutions (PAS) — a key pillar of the COP30 Action Agenda. Through this recognition, climate roadmaps have been elevated as an official PAS, reaffirming the position of buildings at the core of global climate solutions and implementation efforts.
We also succeeded in putting forward the PAS known as “Building Efficiency, Electrification and Renewable Integration” (BEERI) in partnership with C40 Cities and the International Energy Agency (IEA) — which provides the tangible steps needed to align policy, mobilise finance and embed transparent monitoring and verification to drive measurable emissions and resilience gains. To support GlobalABC and its partners, we will help advance the PAS on the Buildings Breakthrough and build on the work we led under Priority Action 1 — enabling governments to deliver near-zero emission and resilient buildings (NZERB). You can explore more in our interim report.
While many Parties were left disappointed that both fossil‑fuel and deforestation roadmaps were not included in the final text, the COP30 Mutirão delivered several important new initiatives on adaptation, implementation, and social justice.
To close the gap and keep 1.5°C within reach, COP30 launched the Global Implementation Accelerator (GIA) and the “Belém Mission to 1.5°C.” These initiatives aim to turn pledges into delivery by strengthening national climate and adaptation plans.
COP30 reminded us that ambition still lags behind science — but multilateralism endured and important new foundations were laid for accelerated action.
Looking ahead, Brazil, Türkiye, and Australia will play pivotal roles in shaping COP31. Their leadership will be critical in advancing fossil fuel phase-out, scaling finance for adaptation, reforming financial architecture, ensuring ongoing visibility and relevance to the Action Agenda, as well as governance and accountability.
One thing is clear: we can no longer rely solely on governments. Private sector leadership will be the engine of progress. Businesses, investors, and innovators must step up to turn commitments into measurable outcomes.
For WorldGBC, the next chapter is already in motion. In 2026, we will scale our Building the Transition Roadmap work globally, empowering Green Building Councils worldwide to collaborate with governments and stakeholders to create practical, locally-owned roadmaps that translate policy into concrete action.
Our ambition is clear: deliver the Action Agenda for 2026–2030, ensuring that sustainable, resilient buildings are at the heart of climate solutions.
The solutions exist. The partnerships are ready. The WorldGBC network is mobilised. Are you willing to step up and lead with us?