A crash course in changing the world.
Why I chose this?!
Well, there are so many ways to "change the world", eg "like" greenpeace on facebook, donate money or even demonstrate. But to spend money wisely is one of the important. Many of us buy a lot of stuff without thinking . So if they want steak five times a week, they just go to the supermarket and buy it. And because of these mass behavior we get more and more imbalance to cultures which can not afford those behavior.
So just start thinking, next time you enter your local supermarkt. Just buy what you need, not what you want.