The 350 day of action is named for 350 parts per million, the amount of carbon in the atmosphere that scientists say would be the safe for the climate. (At the moment, we're at 387 parts per million and climbing fast.). On October 24th, there will be events around the world -  rallies and parties and deep-sea dives and at each one we'll take a photo centred around the number 350. The photos from around the world will be delivered to waiting reporters - and broadcast to the world’s media.

Gathering to pose for a 350 photograph might seem like a small action, but when it's being done thousands of times in thousands of cities, it grows in force, showing global leaders a snapshot of the massive, vibrant groundswell of worldwide citizens demanding solutions on climate change. Let's make this huge.

To find out much more about all this go to 350.org

Come along to Guildhall Square and 12.00 on Saturday 24th and take part. We already have a lot of students ready to take the fight to Copenhagen so come and join them.