Scope 3 emissions are the greenhouse gasses emitted beyond the direct control of your organisation, such as in your supply chain. These are the most difficult to accurately measure, but can be the most significant emissions for some organisations.
Getting to grips with Scope 3 emissions is an advanced activity (though a legal requirement for larger organisations). We've chosen this resource as it is a comprehensive and reasonably succinct guide to the topic.
SSN's tips for users
Don't get bogged down in the detail, if this isn't a legal requirement for you, but do gain a general understanding of the subject. Knowing how emissions arise because of some of the things you do will help you identify ways in which you can reduce them.
Web sites generate emissions! There are a number of resources on the web that will help you see how your own site is performing.
FOr this website, see https://www.websitecarbon.com/website/sheffieldsustainabilitynetwork-org/