Dear teachers ,
I don't understand the phrase in bold in the following passage. Please help me understand it :
" ..The increase in population, however, has led to overcrowding in many cities .This puts a strain on schools and hospitals, as well as water and electricity supplies.Increased pollution is another unpleasant result.
There is also a human side to this tragedy . Families sometimes have to live apart .In these cases , children may live at home with relatives , while their parents go and live in an urban area......."
What are the meanings of " put a strain on " and " There is also a human side to this tragedy ." ?
Thank you in advance