Climate Flash Report

Daily climate technology and sustainability news - Updated: 2025-09-20

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The latest climate technology and sustainability developments as of September 20, 2025, highlight significant funding and innovation across climate tech startups, clean energy investments, ESG trends, and policy momentum:

Climate Tech Startups and Funding

•Brineworks, an Amsterdam-based startup, raised $5.87 million in seed funding to scale its patented technology that extracts CO2 from seawater via electrolysis, producing hydrogen and CO2 feedstocks for sustainable aviation fuels and e-methanol for shipping. The company targets commercial readiness by end of 2026 and emphasizes using low-cost solar and wind electricity to reduce costs. The seed round was led by SeaX Ventures, a San Francisco-based climate-focused VC firm. Brineworks also secured a $2.1 million grant from the European Innovation Council Accelerator program[3].

•Equilibrium, a climate tech startup focused on carbon removal through agroforestry, mangroves, and biochar, raised $3 million in seed funding to expand projects across nine Indian states covering 120,000 hectares. The funding will also support team growth and scaling of carbon removal portfolios[4][5].

•U.S. climate tech funding increased by 21% in the first half of 2025 compared to 2024, despite economic and political uncertainties. The Trellis list highlights 25 early-stage startups innovating in energy, carbon, transport, industry, and nature sectors, with an upcoming event in late October showcasing these companies to investors and policymakers[1].

•Y Combinator continues to fund a broad portfolio of climate startups in 2025, with 49 notable companies supported this year[6].

Clean Energy and Investment Trends

•Global renewable energy investments reached a record $386 billion in H1 2025, up 10% year-over-year, driven by offshore wind and small-scale solar projects. The International Energy Agency projects total energy sector capital flows to hit $3.3 trillion in 2025, with renewable energy investments doubling those in fossil fuels. Low-emissions fuels are expected to attract $40 billion in investments this year[3].

•Leading venture capital firms actively investing in climate tech include Breakthrough Energy Ventures (backed by Bill Gates) and Lowercarbon Capital, focusing on decarbonization technologies such as energy storage, carbon capture, and clean energy[2][7].

Climate Policy and ESG

•While specific new policy details for today are not highlighted in the search results, the involvement of government officials in upcoming Trellis Impact 25 events and the European Innovation Council’s funding of startups like Brineworks indicate ongoing policy support for climate innovation[1][3].

•ESG investing continues to be a key driver for climate tech funding, with investors increasingly prioritizing startups that demonstrate measurable carbon impact and scalable solutions.

Carbon Impact Metrics

•Brineworks’ technology aims to capture historical CO2 emissions from the atmosphere and produce sustainable fuels, contributing to both carbon removal and decarbonization of hard-to-abate sectors like aviation and shipping[3].

•Equilibrium’s projects focus on nature-based carbon removal methods, covering large land areas and involving local farmers, which supports both carbon sequestration and sustainable land use[4][5].

In summary, September 2025 sees robust funding rounds for innovative climate tech startups with promising carbon removal and clean fuel technologies, record-breaking renewable energy investments, and active engagement from venture capital and policy stakeholders to accelerate decarbonization and sustainability goals.

Climate Flash Report

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