Topic 1: Increasing travels between countries enable people to learn different cultures or to increase tension between people from different countries

perpetual 
resource.  For  this  reason,  the 
unbridled 
use of water is commonplace, accelerating the exhaustion of this valuable resource. 
Rapid population growth is another force contributing to the water crisis. Not only does it reduce the 
amount of water available for manufacture, farming and households, but also has a profound effect on 
the  sustainability  of 
aquatic 
ecosystems.  Massive  urban  and  industrial  growth  fuels  unprecedented 
demands, often at the expense of aquatic ecosystems. Many water resources are not