Our sourcing assistants are often asked to recommend products that are 'sustainable'. One of the biggest issues we face is actually defining what constitutes a sustainable product. With so many variables and a lack of universal measure of what sustainable is, it's pretty hard to compare the environmental impact of different products (despite everyone's best intentions!).
We've spent a lot of time thinking about this in our team. After hours of discussion (and heated debate...), we've come to the view that there's no 'one size fits all' here, and it's important for everyone individually to know what aspects of sustainable design are important to them.
We've put together a post on 'Sustainability Criteria' for product sourcing, which should hopefully help you along the way.