You have almost no control over what other people do, yet their behaviors impact the sustainability of the world, and thus impact you.
Other people drive cars even if you don't, other people fly, other people throw away materials they could recycle causing more raw materials to get used to make new products, and so on. No matter how much you help educate people, it's out of your hands. It's an infinite list, and there are a lot of other people out there.
While you can't change everyone else's behavior directly, you can choose to cover some of the footprint that others leave behind.
To cover the balance of other people's footprints, you can purchase Green Credits, which offset the footprint they leave behind. This way, although you can't change their behavior, you can help compensate for it.