When I think of saving the world, I tend to think of helping people or going green, but animals need just as much help as we do sometimes! Especially the animals that are abused, or house pets that were left on the streets by their owners. There are a lot of ways to help, but one of the simplest ones is to visit this site. It's filled with petitions you can sign against animal cruelty and it educates the public about animal abuse. It also keeps updates on current animal cruelty cases.
On a different note, today I was out driving and stopped to get lemonade from a lemonade stand for the first time since getting my license! I'm pretty sure everyone has had a lemonade stand at some point in their life and has noticed that they aren't always very successful, so next time you pass one, why not take a second to make a little kid's day? :)