Care2.com is a great place to help make a difference in the world. They have online petitions to sign, daily clicks, green living articles, news articles. They also have a thing called butterfly rewards, which you earn by commenting on articles, signing polls, recieving green stars from other members, and 14 more. You can spend these rewards as something as simple as offsetting one pond of carbon to something as saving a child's life with antibiotics, they also have 12 others, such as a meal for an abandoned cat, planting a tree, and work gloves for a disaster response team. I encourage you to check it out