Final answer:
Ecolabeling is a voluntary method, not mandatory, which allows consumers to support environmentally-friendly products through informed choices. The UN and WTO contribute to promoting environmental values through treaties and trade policies.
Step-by-step explanation:
Ecolabeling is not a mandatory method of environmental performance certification and labelling; rather, it is a voluntary method that is practiced around the world. Entities such as environmental advocates can set up standards for product labeling, allowing consumers to make informed decisions and apply pressure for environmentalist values.
Additionally, organizations like the United Nations and the World Trade Organization (WTO) play roles in reinforcing environmental values by sponsoring treaties and being mindful of environmental effects due to trade respectively. For example, the increase in the market for organic foods has led countries to establish formal, government-regulated certification processes.