Ok, so it's not perhaps the most important thing in the world. It's not the discovery of a new cure or the overthrowing of a vicious dictator. It's just a new name. Out with Tiger, in with Giraffe. Tiger bread is no longer to be known as tiger bread (well ... in Sainsbury's, anyway!). From now on, we all have to call it giraffe bread.
So, before you give up on something with a 'what difference will I make?' sort of attitude, think about Lily and how she changed the name of Tiger Bread at a major supermarket. 150,000 people might agree with Lily, but they didn't write the letter, did they? Sometimes, all it takes is for someone to get the ball rolling. Even if they're only 3.
And before you squash someone else's idea, think of Lily's Mum, and of Chris King, who helped the idea along.
And if you see someone else who has had a good idea, support it. Grow it. Make it big.