The world is full of opportunities - every day there's something new that you can do. For example, you could make dirty water potable. Why does anyone not have potable water? Because it's a problem that hasn't been solved yet, but it can be.
Your Day Is Your Life
Thousands have lived without love, not one without water.
W. H. Auden
The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it.