When the annual U.N. climate conference descends on the small Brazilian rainforest city of Belém in November 2025, it will be tempting to focus on the drama and disunity among major nations. Only 21 countries had even submitted their updated plans for managing climate change by the 2025 deadline required under the Paris Agreement. The U.S. is pulling out of the agreement altogether.

Brazilian President Luiz Inácio Lula da Silva, Chinese President Xi Jinping and the likely absence of – or potential stonewalling by – a U.S. delegation will take up much of the oxygen in the negotiating hall.

You can tune them out.

Trust me, I’ve been there. As chair of the California Air Resources Board for nearly 20 years, I attended the annual conferences from Bali in 2007 to Sharm el Sheikh, Egypt, in 2023. That included the exhilarating success in 2015, when nearly 200 nations committed to keep global warming in check by signing the Paris Agreement.

In recent years, however, the real progress has been outside the rooms where the official U.N. negotiations are held, not inside. In these meetings, the leaders of states and provinces talk about what they are doing to reduce greenhouse gases and prepare for worsening climate disasters. Many bilateral and multilateral agreements have sprung up like mushrooms from these side conversations.

This week, for example, the leaders of several state-level governments are meeting in Brazil to discuss ways to protect tropical rainforests that restore ecosystems while creating jobs and boosting local economies.

The real action in 2025 will come from the leaders of states and provinces, places like Pastaza, Ecuador; Acre and Pará, Brazil; and East Kalimantan, Indonesia.

While some national political leaders are

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