Can anyone still change the world?

Today we live in a world of "Big Authority" (Big EU, US Military, Big Global Corporations, Big Global Policemen, UN etc) - so, do you think a few people can still personally change the world and make it a better place?

Watching this video from Ashoka. Makes me feel that anyone can still change things to suit the people with dreams of a happy world!
If you have any ideas please mail me. click here