Climate Flash Report

Daily climate technology and sustainability news - Updated: 2025-09-24

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On September 24, 2025, key developments in climate technology and sustainability include a major new venture capital initiative, ongoing challenges in funding, and active innovation in climate tech startups:

•

Climate Tech Funding Initiative

A coalition of over a dozen top venture capital and private equity firms, including Khosla Ventures, Breakthrough Energy Ventures, and DCVC, launched the *All Aboard Coalition* to address the funding gap for climate tech startups nearing commercialization. The coalition aims to close an initial fund of about $300 million by October 2025 to help startups cross the "valley of death" between early-stage funding and large-scale commercial deployment. This fund will complement members' individual funds managing over $40 billion in assets. The coalition focuses on equity or convertible equity investments rather than loans or project finance[1][3].

•

Funding Challenges

Despite this new fund, climate tech startups, especially those developing capital-intensive solutions like direct-air capture, face a steep decline in venture capital. For example, U.S.-based direct-air capture startups saw a 60% drop in venture funding in early 2025 compared to the previous year, partly due to reduced federal support under the current administration[1].

•

Climate Tech Startups to Watch

The annual *Trellis 25 Climate Tech Startups to Watch in 2025* list highlights early-stage companies innovating in five sectors: energy, carbon, transport, industry, and nature. U.S. funding in the first half of 2025 was up 21% year-over-year, indicating some recovery and investor interest despite broader challenges. The list and associated event in October provide visibility and pitching opportunities to sustainability leaders, investors, and policymakers[2].

•

Venture Capital Focus

Leading climate tech investors like Breakthrough Energy Ventures (backed by Bill Gates) and Lowercarbon Capital continue to focus on decarbonization technologies including energy storage, carbon capture, and clean energy. These firms invest from seed to growth stages and provide strategic support beyond capital[4][5].

•

Policy Context

The U.S. federal climate spending has been cut back under the Trump administration, leading to a greater reliance on private capital to fund emissions-cutting technologies. This shift has narrowed funding pathways for startups ready to scale first-of-their-kind projects, increasing the importance of coalitions like All Aboard to signal investment worthiness to larger institutional investors[1][3].

•

Carbon Impact Metrics

While specific carbon impact metrics for the new fund or startups were not detailed in the latest news, the focus on direct-air capture and other emissions-reducing technologies implies a goal of significant CO2 removal and decarbonization aligned with net-zero targets[1][2].

In summary, the latest climate tech and sustainability developments on September 24, 2025, center on a $300 million venture coalition to bridge funding gaps for startups, ongoing funding challenges especially for direct-air capture, active startup innovation recognized by industry lists, and a policy environment shifting more responsibility to private investors for scaling clean energy and carbon reduction technologies.

Climate Flash Report

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Climate Tech Funding Initiative

Funding Challenges

Climate Tech Startups to Watch

Venture Capital Focus

Policy Context

Carbon Impact Metrics

Climate Tech

Clean Energy

Climate Policy

Renewable Energy

Climate Data

Sustainability

Environmental Impact

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