There are those things we are given some control over (e.g. self-restraint and the words and actions we choose).
Then, there are those things that are really out of our control (e.g. the action of others, population growth, etc.)
Take a look at this picture and pinpoint Earth... if you could do that with ease, then pinpoint yourself on it... ok, done that too... what about yourself 100 years ago or 100 years into the future!
(Don't forget that we can't even see this with our naked eye).