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The latest developments in climate technology and sustainability on September 13, 2025, highlight a significant new funding initiative aimed at overcoming a critical financing gap for climate tech startups. A coalition of 14 top venture capital and private equity firms, managing over $60 billion in assets and called the All Aboard Coalition, has launched a $300 million fund to help climate tech companies scale from pilot projects to commercial operations, addressing the so-called “valley of death” or “missing middle” in funding[1][4][5].

This fund targets rounds of $100–200 million needed for building manufacturing facilities, testing prototypes, and deploying commercial systems, which traditional venture capital often avoids due to high risk and capital intensity. The coalition includes major players like Breakthrough Energy Ventures, Khosla Ventures, DCVC, and others, leveraging their collective assets to signal confidence to larger institutional investors[1][2][4][5].

In terms of carbon impact, the fund aims to support technologies that could cut emissions by gigatons by 2030, potentially generating billions in revenue while advancing a low-emissions global economy[1]. This initiative comes amid a broader context of declining federal support and venture funding for climate tech in the U.S., with direct-air capture startups seeing a 60% funding drop year-over-year in early 2025[2].

On the clean energy and climate tech startup front, the U.S. saw a 21% increase in funding in the first half of 2025 compared to the previous year, despite political and economic uncertainties. The annual Trellis list highlights 25 promising early-stage startups innovating in energy, carbon, transport, industry, and nature sectors, with an upcoming event in October 2025 to showcase these companies to investors and policymakers[3].

Regarding ESG investing and climate policy, the private sector is stepping up as public funding wanes under the current U.S. administration, which has cut back on climate spending. The All Aboard Coalition’s collective action model represents a new approach to mobilizing private capital for climate solutions, aiming to fill the funding void left by reduced government grants and support[2][4].

In summary:

| Aspect | Details |
|-------------------------|----------------------------------------------------------------------------------------------|
| Funding Initiative | $300 million fund by All Aboard Coalition, backed by $60B in assets, targeting $100–200M rounds |
| Key Players | Breakthrough Energy Ventures, Khosla Ventures, DCVC, Ara Partners, and others |
| Carbon Impact | Potential to cut gigatons of CO2 emissions by 2030 |
| Funding Trends | Q2 2025 climate tech funding fell to $5.9B globally; U.S. first half 2025 funding up 21% YoY |
| Policy Context | Reduced U.S. federal climate spending under Trump administration; private sector fills gap |
| Startup Innovation | 25 Climate Tech Startups to Watch in 2025 across energy, carbon, transport, industry, nature |
| Upcoming Events | Trellis Impact 25 event in October 2025 showcasing startups |

This collective funding effort and the spotlight on innovative startups represent critical steps toward scaling climate technologies and advancing sustainability despite current funding challenges[1][2][3][4][5].

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