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Unformatted text preview: about the excessive use of tin and copper 1 Are Natural Resources a Limit to Growth? Improvements in Resource Conservation o At this time, these were crucial commodities: tin was used to make many food containers and copper was used to make telephone wire 2 Are Natural Resources a Limit to Growth? Improvements in Resource Conservation o Some people advocated mandatory recycling of tin and copper so that supplies would be available for future generations o Today, however, plastic has replaced tin as a material for making many food containers and phone calls often travel over fibre-optic cables, which are made from sand 3...
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- Fall '09
- Technological advances, Resource Conservation