This is a wonderful question! I would say start with who/what you know. Educate yourself, and those yourself closest to. Find ways that you and your friends/family can do more to help the cause that you're interested in. Everything from the food we eat to the clothes we wear to the ways in which we choose to travel make a huge impact on the world around us. Even just a few people doing something small can add up! You and your friends can start a website together for educational purposes. Ask if your school will allow you to publish a small editorial on their school website with weekly tips and useful how-to's. Set up a local meeting/club to get your peers interested in the many things they can do to help the cause. hold workshops teaching people simple tricks, like learning to mend their own clothes and using the bus routes effectively. I have published a few hubs that might help you get started. If you have any more questions please let me know! Hope this helps you!