Want to reduce carbon levels in the atmosphere?
Support your local pasture based farming. Raising livestock on pasture soaks up carbon, and nitrogen (legumes for free fertilizer), far better than crop land and provides a diverse ecosystem for wildlife. Best of all, get your pasture raised meat from small, local, family operations. Many small producers means better food security and helps keep your money in your local economy - an extra bonus.
Support your local sustainable forestry. Forests that are regularly harvested suck up a lot more carbon than those that go into maturity stagnation. Cutting trees and planting new trees, or just letting the regen do it, is a huge way to sequester carbon.
Both of these are things that sequester enormous amounts of carbon long term.
While you're at it, reduce your carbon footprint. Attack the problem at both ends.