According to some estimates, the use of certified products has led to some decreases in C02 emissions, resource consumption and waste disposal. Obtaining the Eco-Mark has become the norm for major manufacturers, which suggests that the awarding criteria need to be constantly revised to ensure that the environmental impact of a labelled product is substantially lower than average. For instance, an energy efficiency label is associated with products that achieve Top Runner targets, and a uniform energy conservation label applies to some home appliances. Many companies have also launched their own eco-labels.