"World" does not necessarily mean all 7 billion people on all 7 continents.
Your world could be the entertainment industry.
Your world could be the education system.
Your world could be a church small group.
Your little league team.
Your world refers to your realm of influence. That is something that we all have. That is a change we can all make.
Some are called to change a million lives.
Others are called to change one life, a million times.
Chances are, you are somewhere in the middle.
Go, change your world.