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An ECO-MARK is a scheme for labelling environment friendly consumer products. This means that products that are labelled with an ECO-MARK are considered to be environmentally friendly or sustainable.
Option 1 is incorrect as an ECO-MARK is not specifically for labelling pollution-free industrial units. It aims to label consumer products that are eco-friendly.
Option 3 is incorrect as an ECO-MARK is not related to cost-effective production techniques. It focuses on the environmental impact of the product rather than the production technique.
Option 4 is incorrect as an ECO-MARK is not an international certification for eco-friendly buildings. It applies specifically to consumer products, not buildings.
Therefore, option 2 is the correct answer. An ECO-MARK is a scheme for labelling environment friendly consumer products.