Brown took a phone-call from our September 21st flashmob in Londonís Parliament Square, and promised to go to Copenhagen and work for a fair, ambitious and binding treaty.

Now, with the summit in danger of failure, he is one of our best hopes to champion a strong deal -- and refuse to accept a weak one. We can use this opportunity to find out more about these fast-moving talks, and send him a clear message that people around the world want him to stay strong for a real deal.