By Kate Abnett BRUSSELS (Reuters) – The European Union has drafted plans to require companies to back up green claims about their products with evidence, in a bid to fight greenwashing and misleading advertisements, according to a document seen by Reuters. The draft legal proposal by the European Commission aims to clamp down on companies promoting their products as “climate neutral” or “containing recycled materials” if such labels are not substantiated. EU countries would have to ensure environmental claims are proven against a science-based methodology, such as a “product environmental foot…