Green Island Cement is turning oyster shells into cement for buildings in Hong Kong. Oyster shells are 91 per cent limestone, which is a key ingredient in cement. Mining limestone usually produces ...

Oyster shells are bulky and plain, but the treasures they hold go beyond their tasty meat and beautiful pearls. One company in Hong Kong is turning them into materials for constructing buildings.

The market price of important means of production in circulation means the wholesale price and sale price of enterprises trading important means of production. Different with the producer price, the ...