19. Waste: what do I need to collect? Waste refers to the waste produced by your buildings or events. Waste tonnage can be found in bills/reports provided by your waste contractor which should include a breakdown per waste stream e.g. landfill, recycling. If you don’t have access to this information you use the CG Tools to estimate your waste impact by recording the size and frequency of your waste collections. To do this you will need to record the number and size of your bin collections monthly for each waste stream e.g. two 500L bins collected twice a week going to landfill.