Despite ongoing challenges, significant advancements in climate action emerged in 2025. While global greenhouse gas emissions continued to rise, investments in the clean energy transition reached a record high of $2.2 trillion, according to the Energy & Climate Intelligence Unit (ECIU). This increase reflects a growing commitment to decarbonization, even as pledges from various nations remain insufficient to avert severe climate change impacts.
Gareth Redmond-King, the international lead at the ECIU, acknowledged the mixed nature of the news, stating, “Is this enough to keep us safe? No, it clearly isn’t. Is it remarkable progress compared to where we were headed? Clearly it is.” In addition to financial investments, 2025 witnessed unprecedented levels of renewable power capacity, lower battery costs, and enhanced protections for international waters.
Clean Energy Investment Surges
Investment in clean technology significantly outpaced funding for fossil fuel projects. According to ECIU data, for every $1 invested in fossil fuels, $2 was allocated to clean energy initiatives. Notably, among the four largest global polluters—China, the European Union, the United States, and India—the ratio was even more favorable at $2.60 for clean energy.
In the first half of 2025, renewable energy funding reached $386 billion, marking a 10% increase from the same period in 2024, as reported by BloombergNEF. Wind and solar energy sources successfully met all new global electricity demand in the initial nine months of the year, with projections indicating an 11% rise in renewable capacity compared to 2024.
China continues to lead the charge, contributing 66% of new solar capacity and 69% of new wind capacity globally this year, according to Ember, a UK-based energy think tank. Growth in renewable energy was also evident in various regions across Asia, Europe, and South America.
Technological Innovations Shape the Future
The surge in demand for artificial intelligence (AI) is driving investments in green technology, reversing a trend of stagnation. In the first three quarters of 2025, global clean tech investments surpassed all of 2024’s figures, marking the sector’s first annual increase since its peak in 2022. The S&P’s clean energy index rose by approximately 50% this year, outperforming most other stock indices.
AI is not only enhancing climate solutions but also streamlining research and forecasting. For instance, self-driving electric vehicles by Waymo utilize AI to optimize routes, reducing their carbon footprints. Similarly, AI-enabled scanning systems are deployed by bridge inspectors to protect infrastructure against extreme weather events.
Battery prices have also seen a significant decline. BloombergNEF reported that prices per kilowatt-hour dropped by 8% to a record $108, with forecasts indicating a further 3% decrease next year. This reduction is attributed to advancements in manufacturing and competitive production levels, making electric vehicles more accessible and economically viable.
International Climate Agreements and Adaptation Efforts
In a year marked by political shifts, the international community achieved notable milestones. The High Seas Treaty, which aims to protect areas of ocean not governed by any country, is set to come into force in January 2026 after securing the necessary ratifications. This treaty will establish frameworks for marine protected areas and mandate environmental assessments for potentially harmful activities.
In July, the International Court of Justice delivered a groundbreaking advisory opinion that countries could violate international law by failing to limit global warming to 1.5°C, as stipulated in the Paris Agreement. This ruling, brought forth by representatives from Vanuatu, could serve as a catalyst for increased government accountability regarding climate action.
While the United States experienced a rollback of key environmental policies under the Trump administration, countries like Australia, Denmark, and the United Kingdom announced ambitious emissions reduction targets. Meanwhile, cities worldwide are implementing measures to promote walking and cycling, with New York City successfully reducing congestion and air pollution.
Adaptation strategies are also gaining traction. The Bill & Melinda Gates Foundation pledged $1.4 billion over four years to enhance agricultural resilience in Africa and Asia. Moreover, a new agreement at the UN climate summit aims to triple adaptation finance to $120 billion per year by 2035.
Recent climate events have highlighted the importance of innovative financial instruments such as catastrophe bonds. Following Hurricane Melissa, which devastated Jamaica and caused substantial economic loss, the country received a full payout of $150 million from its catastrophe bond, demonstrating the effectiveness of these tools in managing climate risks. In North Carolina, a new cat bond incentivizes adaptation by rewarding the installation of wind-resistant roofs, drawing significant investor interest.
As 2025 comes to a close, the dual narrative of rising emissions alongside significant advancements in clean energy investment and climate policy underscores the urgency of continued efforts in tackling climate change. The progress made this year could serve as a foundation for transformative action in the years to come.
