With 2 billion pairs of eyes expected to be firmly clamped on the Live Earth concerts tomorrow, the word about climate change will be spread far and wide. Although, as George Marshall argues, perhaps enough people already know and they're just waiting to be forced into doing something about it through new laws introduced by their government.
We don't have to wait, though - in fact, we can't wait. Even the most optimistic predictions about the effects of climate change say that we need to take immediate action. So if watching Madonna cavorting around has spurred you on, what can you do here and now? Funny you should ask...