Climate change - are we on the brink?

Some powerful stuff from Johann Hari in today's Independent about climate change.
He thinks we all know what needs to be done to avoid ecological disaster but asks whether we have the courage to do it.
'Are we a great generation – or the worst of all?'
When you read something like this you begin to realise just how politically impotent we all are individually. Collectively we can make a difference but the difficulty lies in finding how we can band together to force change.