Participated · Equity · Jul 2026

StratX develops nature-leveraged landfill covers that combine locally available soil and gravel with indigenous microbes to oxidise methane before it escapes to the atmosphere. The company also builds proprietary measurement technology to reduce uncertainty in landfill gas quantification, enabling the generation of high-integrity, permanent carbon credits. StratX was developed with support from Deep Science Ventures. Its commercial model installs covers at no cost to landfill operators or municipalities and shares top-line carbon credit revenues with operators, host governments and local communities, positioning older landfills as potential revenue-generating assets. Pilot projects are being assessed in the Global South, with initial site focus in Tanzania, Colombia and Chile, and broader deployments planned across Asia, Africa and South America using the newly raised capital. The company aims to address both climate and local public-health risks from unmanaged dumpsites through fast-to-deploy, low-cost interventions.

Participated · Seed · Jun 2026

Astracite is building carbon-negative battery anode materials that convert captured CO2 and silicon into high-performance graphite aimed at increasing lithium-ion battery energy density and reducing cost and supply-chain dependence. The team participated in Carbon13’s programme, which helped them secure investor introductions and raise an oversubscribed €750k pre-seed round. They also received €380k in funding from the Flemish Innovation Agency to support development. Coverage notes the company secured investor backing before having a prototype. The newly raised capital is intended to accelerate development of Astracite’s green graphite battery technology. The articles do not report revenue, users, or other operating metrics.

Participated · Equity · Nov 2024

SeaO2 develops Direct Ocean Capture (DOC) technology that extracts CO2 from seawater and returns carbon-free water to the ocean, enhancing the ocean's ability to absorb atmospheric CO2. The company plans to scale from prototype to a pilot plant with an expected annual capacity of 250 tons of CO2, scheduled for launch in summer 2025. SeaO2 intends to use recent funding to accelerate technology development, expand the team, and implement a comprehensive Monitoring, Reporting, and Verification (MRV) system. It has set removal targets of one megaton of CO2 by 2030 and one gigaton by 2045. The company has established strategic partnerships with XPRIZE Carbon Removal, TU Delft, Klarna, Wetsus, and Redstack and participated in a carbon removal project with Paebbl in the Wadden Sea. Financially, SeaO2 raised over €2m in the reported funding round to support these plans. SeaO₂ is an Amsterdam-headquartered startup (founded in 2021) building ocean-based CO₂ removal systems that lower seawater pH with electrodes across a membrane to liberate gaseous CO₂. The process treats water offshore, releases CO₂ which is captured, and then returns decarbonized water to the surface to re-equilibrate. Captured CO₂ is intended for permanent underground storage. The company operates a prototype in the North Sea launching from the REDstack renewable energy plant at the Afsluitdijk dam and plans a larger pilot by the end of 2023. The initial prototype can extract about one ton of carbon per year; the next pilot is slated to extract 250 tons per year. SeaO₂’s stated ambition is to remove 1 gigaton of carbon by 2035. Ledgy has partnered with and made an early commercial pre-purchase to help validate SeaO₂’s commercial model and support its R&D.