A window into what we’re reading at the Stimson Center’s Environmental Security Program 

Experts Sound Alarm Over Peru-Brazil Biooceanic Railway Risks (Mongabay) 

A proposed railway linking Peru’s Pacific coast to Brazil’s Atlantic is drawing alarm from conservation experts and Indigenous rights advocates. Brazil and China signed a feasibility study agreement for new route crossing both the Andes and the Amazon rainforest in July 2025, with China playing a central role in financing and development. Two alternatives are under consideration, with one running through Peru’s Ucayali region and the other through Madre de Dios, but neither has been approved. A single line could impact 15 protected natural areas, threatening over 1,800 campesino communities, as well as territories inhabited by Indigenous peoples in voluntary isolation. 

This article was originally published as a commentary by the Stimson Center.

If anyone needed a signal of global interest in critical minerals and supply chains, the events in Washington D.C. earlier this month offered a clear one. In the midst of questions about the reliability of U.S. partnerships, uncertain tariff policy, and rhetoric around annexing Greenland, 54 countries and the European Union came together in D.C. at the Critical Minerals Ministerial to seek deeper collaboration to secure critical minerals supply chains and de-risk from China’s influence.

With a reduction in capacity of bilateral and multilateral institutions and a broader political retreat from environmental protection and peacebuilding, environmental peacebuilding reached a turning point in 2025. This was the conclusion of leading experts who spoke at The Year in Review and the Year Ahead  webinar hosted by the Environmental Peacebuilding Association, as they reflected on the mounting constraints posed by this altered landscape.

A window into what we’re reading at the Stimson Center’s Environmental Security Program

Final Version of Global Critical Minerals Treaty Stripped of Traceability Measures (Mongabay)

At the seventh U.N. Environment Assembly in December 2025, Colombia and Oman jointly proposed a legally binding international treaty to create traceability and due diligence mechanisms across global mineral supply chains. Their proposal faced resistance from multiple countries including Saudi Arabia, Russia, Iran, Chile, and Uganda, and ultimately resulted in a watered-down nonbinding resolution on mineral governance that excluded traceability provisions entirely.

Multilateralism is under threat, as many global powers increasingly choose to center their security priorities around defense and economic competition over international cooperation. This shift toward short-term national interests risks undermining progress on joint challenges, including climate change, peace and justice. What will be lost if the climate security agenda becomes a battlefield of competing interests? How can peacebuilding and development actors respond?

Artificial Intelligence (AI) has the potential to reshape how data and knowledge are produced, shared, and used in transboundary water negotiations, but it also risks entrenching political imbalances, deepening mistrust, and displacing the need for genuine cooperation.