350.org was founded by U.S. author Bill McKibben, who wrote one of the first books on global warming for the general public, and a team of university friends.

Together, they ran a campaign in 2007 called Step It Up that organized over 2,000 rallies at iconic places in all 50 of the United States. These creative actions - from skiers descending a melting glacier to divers hosting an underwater action - helped convince many political leaders, including then Senator Barack Obama, to adopt our common call to action: cutting carbon 80% by 2050.

Now, 350.org is building off of Step It Up's model of creative activism and making it global.  Through 350.org, the team has expanded to include young people from all over the world.  This global team has helped mobilize over 5200 actions in 181 countries on October 24th—check out some of the pictures below. CNN called it 'the most widespread day of political action in the planet's history.'

The team took that message to the big UN climate conference in Copenhagen in December of 2009—a conference that fell apart because some nations weren't yet ready to start making serious cuts in their emissions.

So now we're building an even bigger and stronger movement. On October 10 we'll be helping host a Global Work Party, with thousands of communities setting up solar panels or digging community gardens or laying out bike paths.

Those projects are designed to send a sharp message to our political leaders: We're getting to work, what about you?