The times they are a-changin'. Some Jewish folk singer from Minnesota said that in the 60s, and it turns out it's still true today. For instance

That's where Carrotmob comes in.

Carrotmob is hands down one of the best models for activism there is

See? Reverse boycott. Instead of shunning companies that do ill, Carrot Mob has created a huge incentive for businesses to do good. And usually, the mobbers win, too

So let's see

As you can tell, there are absolutely no disadvantages to participating in Carrotmob (unless you count showing up somewhere for cheap stuff a hassle). Which is why joining the Mob might be the easiest and most effective kind of green activism you can do.

So head over to CarrotMob's website, and see about joining an activist movement for the 21st century. Before the times change again.