Depending on their priorities and availability of resources, rather than estimate the total amount of waste generation, countries may prefer to focus on certain waste types that are important to them. Such types of waste may be selected either because they are recyclable or reusable and thus constitute a resource (e.g., paper, glass or metal waste), or because their volume or hazard level creates a specific problem for treatment and disposal. An important aspect of data collection on waste (by type of waste) is food waste. Approximately one-third of food produced globally is lost or wasted.65 This represents a large portion of the environmental costs of agriculture production.