OP--I think I get it. You just want to see some examples of how others are "starting with the man in the mirror." Right?
Anyway, I think EVERYONE matters. Our actions WILL make a difference--good or bad or often both. The heart of the question, as I read it (sorry if I am totally off base OP) is what do you do to make the world a better place and how concious are you of the effects your actions have on others/the enviornment, etc?
I am pretty aware most of the time that things I do affect more than just me or my family. I try to think of hte bigger picture and the more long term consequences pretty regularly.
I guess I do lots of little things. The things that would make a huge difference if we all did them instead of worrying about how small it is when it is just us and the ignoring them because it is small. I also try not to point these things out and be annoying and snobbish, but I do not hide what I do and will answer honestly if someone asks why I do not shop at Wal Mart or why I just unplugged the computer before leaving the house or whatever.
I try to treat everyone with respect and kindness. Along with that I try to notice when someone needs a little help and offer it is I think they do. It might just be holding a door or helping a mom get a stroller off the train.
I am raising my children with lots of love and to be kind, loving, respectful and responsible people.
I do "bigger" things too like donating to causes I believe in and volunteering in the school library or other places, hosting Fresh Air Fund children and exchange students, etc. But I honestly believe it is the little things which make the most difference. Funny, one thing I have seen make a differnce is something I never thought of as "doing" anything. I have photos up on the house of my family with my best friend's family. Several of them. I never thought twice about it. I have lots of photos up it is just what I do. Anyway, time and again people have commented on these photos. I am pretty sure I have made at least a few people think twice about how they perceive some differnet families and how they may treat some people just by seeing that my family (who they know well and are okay with having the kids play with or whatever) feels about a family they may have origianlly considered associating with (sorry to be so unclear here--trying very hard to explain myself as it relates to the question without getting political

).