Acclimate Ventures

Founded in 2024 and headquartered in Oxford, United Kingdom, Acclimate Ventures is a venture capital firm investing in early-stage deep tech climate startups across the United States and United Kingdom. Its thesis centers on planet-positive innovation, backing companies with global scaling potential, with a particular focus on the technologies underpinning AI compute and data center infrastructure—portfolio companies include Exowatt (modular energy for data centers), Ferveret (liquid cooling), GridCARE (grid interconnection AI), Amperesand (solid-state transformers), and Vaire Computing (near-zero-energy compute). As of writing the firm has made roughly six investments and frequently co-invests alongside top-tier funds including a16z, Y Combinator, Felicis, Mayfield, Sutter Hill, Breakthrough Energy, and corporate investors NVIDIA, Intel, Cisco, and Samsung. The firm is led by founder Mark Younger, a former operator at Apple, Samsung, SmartThings, and RapidSOS, a Visiting Fellow at the University of Oxford, and an MBA/MPA holder from Harvard. Fund size, vintage, and typical check size are not publicly disclosed. Contact: via the firm's website or Mark Younger on LinkedIn.