Tomorrow is International Day of Climate Action, and people all over the world will gather in groups to take a stand against climate change. Photos from events all over the world will be submitted to 350.org, who will put together a giant, visual petition (in time to use at the UN Climate meeting in Copenhagen, taking place in December).

During tomorrow's many events, the focus will be on the number 350 - representing 350 parts per million, which is the safe limit for atmospheric c02.

Search 350.org to find a group gathering in your area.

Have a great weekend!