Tim Camisa wants to put carbon back in the ground. “There is too much carbon in the air,” the Vermont Organics Reclamation cofounder says, “and it contributes to climate change.” This endeavor is the root of Soil Fest, a community gathering at which green thumbs can learn how to use their farms, gardens and yards to curb global warming. Judith Schwartz (pictured), author of Cows Save the Planet, keynotes the free event. Eco-conscious growers can get their hands dirty with workshops, interactive demonstrations and exhibits while enjoying food and live music. Don’t be late — early birds can put their new knowledge to use with free perennials.