Disposable cups can only be placed in red bins. This includes all cups marked biodegradable or compostable. Biodegradable and compostable coffee cups are a more responsible purchase but they cannot go into your green or yellow bin. Most disposable coffee cups are lined with plastic polyethylene and therefore cannot be recycled or composted. There is no method available to differentiate between these different types of disposable coffee cups during the recycling or composting processes and all a classified as contamination.