In a strict sense, recycling of a material would produce a fresh supply of the same material, for example used office paper to more office paper, or usedfoamed polystyrene to more polystyrene. However, this is often difficult or too expensive (compared with producing the same product from raw materials or other sources), so "recycling" of many products or materials involves their reuse in producing different materials (e.g. cardboard) instead. Another form of recycling is the salvage of certain materials from complex products, either due to their intrinsic value (e.g., lead from car batteries, or gold from computer components), or due to their hazardous nature (e.g., removal and reuse of mercury from various items).Critics of recycling claim that it often wastes more resources than it saves, especially in cases where it is mandated by the government. Note here that municipal recycling may nevertheless still be worthwhile if the net cost is less than the landfill or other disposal costs for the same amount of material.
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