Climate Flash Report

Daily climate technology and sustainability news - Updated: 2025-09-15

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The latest climate technology and sustainability developments on September 15, 2025, highlight a significant new funding initiative, ongoing challenges in climate tech financing, and active innovation in clean energy and ESG investing.

Climate Tech Startups and Funding

•A coalition of 14 top venture capital and private equity firms managing $60 billion in assets, called the All Aboard Coalition, has launched a $300 million fund to support climate-tech startups transitioning from pilot to commercial scale. This fund targets the critical "valley of death" funding gap, providing rounds of $100–200 million to help companies build manufacturing facilities, test prototypes, and scale operations[1][2][4].

•The coalition includes major investors such as Breakthrough Energy Ventures, Khosla Ventures, DCVC, and others, aiming to collectively propel climate innovations to global scale[4][5].

•Despite this new fund, overall global climate tech funding fell to $5.9 billion in Q2 2025, the lowest quarterly level since 2020, reflecting broader challenges in securing capital for expensive, long-term climate solutions[1][2].

•U.S.-based startups working on direct-air capture technologies saw a 60% decline in venture funding in early 2025 compared to the previous year, illustrating the funding squeeze in critical carbon removal technologies[2].

•The Trellis Impact 25 initiative continues to spotlight 25 promising early-stage climate tech startups across energy, carbon, transport, industry, and nature sectors, with U.S. funding in the first half of 2025 up 21% year-over-year, indicating some resilience in early-stage investment despite broader funding challenges[3].

Clean Energy and Environmental Innovations

•The new fund and coalition focus on clean energy and decarbonization technologies, aiming to accelerate commercial deployment of innovations that reduce emissions and support net-zero goals[1][4].

•Venture capital firms like Breakthrough Energy Ventures and Lowercarbon Capital remain active investors, focusing on energy storage, carbon capture, food/agriculture, and transportation sectors[5].

ESG Investing and Climate Policy

•The private sector is stepping up as federal climate spending declines under the current U.S. administration, with venture capitalists adopting new collaborative models to fill the funding void left by reduced government support[2].

•The All Aboard Coalition’s collective action approach reflects a strategic shift in ESG investing, emphasizing community-backed funding to overcome systemic barriers in scaling climate tech[1][4].

Carbon Impact Metrics

•While specific carbon impact metrics for the new fund’s portfolio are not detailed, the focus on direct-air capture and decarbonization technologies implies a strong potential for significant emissions reductions once these startups reach commercial scale[2].

Policy Details

•The current U.S. federal climate policy environment is characterized by cutbacks and grant freezes, which have narrowed funding pathways for climate tech startups, increasing reliance on private capital and coalition efforts[2].

In summary, September 2025 sees a critical new $300 million venture fund backed by a $60 billion asset coalition aiming to bridge the funding gap for climate tech startups at the commercialization stage, amidst a challenging funding landscape marked by declining public support and venture capital pullback in some sectors. This development is a key step toward scaling clean energy and carbon reduction innovations with significant potential climate impact. Early-stage innovation remains active, supported by initiatives like Trellis Impact 25 and focused VC firms.