SMART INVESTMENTS. SUSTAINABLE CHANGE. Green Angel Syndicate (GAS) is the UK's largest network of specialist investors fighting climate change. Green Angel Syndicate is a network of specialist investors who are committed to the transition to a greener economy. We support startups and early-stage technology companies developing products and solutions for a more efficient and sustainable use of global resources. GAS has over 330 members and has invested in 28 start-up and early-stage companies across 10 different economic sectors.