We're getting ready for our most ambitious venture yet.

From November 7th to December 3rd, I'll be on the road, visiting 20 cities in 20 nights (with a few days for travel in between) to help bring together the movement we need to make sure this planet has a future that we can all appreciate.

We're calling it the Do the Math tour, but it's not (thank heaven) just going to be me standing in front of a microphone. The goal is to jump-start the kind of movement that I discussed in the article I wrote for Rolling Stone about the scary new math of climate change. We will bring together musicians, artists and voices from across the movement to work together on directly confronting the financial and political might of the fossil fuel industry.

If you are near one of our stops, I want to make sure you’re there with us. You’re exactly the people we need to be there -- folks who understand the climate math already, have experience in the movement, and are willing to step up to do more.

These events will need to be big, and reach beyond our normal circle of friends. That’s why we need to make sure that everyone knows that something big is underway. Can you take a moment to share the Do the Math tour site with your social networks?

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Also, just a heads up -- we’re going to be putting together a live web event so that everyone who doesn’t happen to be near a tour stop can still get together and get a campaign started in their community. Our team is still hammering out the details for the exact date and time, but please keep an eye out -- we absolutely need you in this fight.

I do a lot of talks to big groups, but this is a new kind of undertaking for me, and for 350.org. We’re trying to quickly build up some serious momentum, which is why we’ve gone to great lengths to make this a very different kind of event.

Not only will we have music and guests like Naomi Klein, Jim Hansen, Desmond Tutu, in person and via video, this event is also the kickoff to some serious organizing in your community. This tour will launch our next big mission -- a campaign to directly confront the economic power of the fossil fuel industry. Our message will be crystal clear: it's not OK to sacrifice our future for the sake of one industry’s bottom line. Divestment is one important tool that we'll discuss, but we're ready for many other tactics as well.

Over the past few months our planet gave stark warning signs that humans have never seen before. The Arctic melted, breaking every record. The Great Plains sweltered. The West burned. This roadshow is the next big step -- but the price of admission, besides the ticket, is a willingness to really go to work to change the world in the year ahead. That’s why we need you this November.

The stakes have never been this high, and I've never been more serious.

Please join us: math.350.org

--Bill McKibben for 350.org

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