very unhappy
miserable
to give up something to achieve something else
sacrifice
to judge the value of something
evaluate
being in charge of something
responsible
when people make the environment dangerously dirty
pollution
the natural world
environment
something that is sent into the air
emission
when dirty things are removed so that people can maintain good health
sanitation
to suddenly open so that the air or other substances inside come out
burst
someone who is the same age as someone else
peer
without any particular plan or pattern
random
a building where criminals are kept as a punishment
prison
something that is thought to be most important
priority
a bad feature that causes problems
drawback
the money that is earned from your work
income
in or to a foreign country
abroad
