Leafr

Leafr is a platform that connects businesses with a network of vetted, independent sustainability specialists. Founded in 2022 by Gus Bartholomew and Nick Valenzia, the London-based company aims to address the growing climate skills gap by providing companies with on-demand access to expertise.

The founders' backgrounds informed the company's mission. Gus Bartholomew previously co-founded SupplyCompass, a SaaS platform for sustainable fashion supply chains, while Nick Valenzia focused on corporate impact and sustainability. They identified that businesses of all sizes struggled to find and afford the specialized skills needed to meet their sustainability goals. Leafr was created to bridge this gap, offering access to over a thousand specialists in fields like carbon accounting, ESG advising, and biodiversity.

The company operates a platform model, which allows it to offer these specialized services at a lower cost than traditional agencies or consultancies. It serves a wide range of clients, from startups to large corporations across various sectors including tech, finance, and consumer goods. Businesses can post projects ranging from short one-hour consultations to six-month roles. Leafr facilitates the entire process, from managing applicants to providing contracting templates and handling project administration. The platform offers services such as sustainability strategy development, Life Cycle Assessments (LCA), B Corp certification guidance, and emissions calculations. In February 2025, Leafr raised $758K in a seed funding round led by Haatch.

Keywords: sustainability consulting, ESG services, freelance marketplace, climate expertise, carbon accounting, sustainable business, B Corp certification, environmental impact, corporate sustainability, green talent