The WECC (West of England Carbon Challenge) is a network of businesses and organizations in the Bristol and Bath region working to become more sustainable. It functions like a fitness club by providing networking events, expert speakers, case studies, and tools to help members improve sustainability but on a larger scale by working together. The document outlines some examples of initiatives members like Parsons Brinckerhoff, Pukka Herbs, Buro Happold, and Back to the Planet have undertaken. These include reducing air travel emissions, installing energy efficient equipment, and measuring sustainability progress. The WECC aims to build a network of green businesses in Bristol and encourages joining which is free and offers benefits like networking, resources, and positive publicity.