a patent-free
invention
public
speaker
personal
life
pollute the
environment
cars> a form of
transportation
cause
air pollution
relevant
to young people
afford a
car
interested
in an invention
bear
in mind
take
into account
adds another
interesting angle
discuss
a point
give the problem
some thought
it doesn’t
matter
to pose
a problem
overlook a
point
take up
a career
make
money
donate
money
make a
difference
private
life
committed
to creating a better world
take on
the responsibility