Answer:
Who keeps the ocean clean?
I am a mini solar powered computer
Where I am there is no south, west, nor east, and weather is not fit for man or beast. What am I?
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.