Whatever it is, hopefully it won't involve the release of greenhouse gases. I will probably ride my bike (surprise!). Training ride in the morning, then grocery run in the afternoon. If I'm feeling energetic, I may ride down to the farmer's market, instead of the neighborhood Thriftway, and pick up some local produce.
What's so special about October 24th? It's International Day of Climate Action. It's being organized by 350.org, dedicated to "building a movement to unite the world around solutions to the climate crisis--the solutions that science and justice demand". The number "350" refers to 350 parts per million, a level scientists have determined as the safe upper limit for CO2 in the atmosphere.
We're currently at 387 and rising, so there's a bit of work to do. 350.org recognizes it will take much more than individual action to reverse course. There's nothing wrong with switching out lightbulbs, driving less, and getting an electric lawnmower, but governments need to step up and stop subsidizing the extraction, production, and consumption of fossil fuels.
So leave the car in the garage and take a walk around your neighborhood. Let your family and neighbors know why you're taking a stand. And then call your elected representatives and ask them what they're doing to stop the destruction of our planet.