Answer:
Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.
Answer:
Silent Trade
Explanation:
Silent trade is a form of the old style of trading which is even more common to the West Africans.
It involves a situation whereby traders who do not understand each other's language, tried to perform trade.
To trade successfully, for example, PARTY A would leave trade goods in a secret but a known place to the buying party, and make a loud signal that good is left somewhere. PARTY B would then get to the place, examine the goods, and deposit their object of exchange that they wanted to exchange, and withdraw.
