If we ignore normal biological processes, that would leave transportation, keeping warm/cool, and production of useful but not necessarily crucial items made from organic substances; and we should give up....what? Every item that man produces locks some carbon up to one degree or another. We quell forest fires as best we can and preserve the wood in the form of useful things. We lay asphalt roads at a prodigious rate. We paint everything. It is hard to find things in the room you are sitting in that does not contain carbon, my wife's jewelry being a notable exception. Now, it is the production of these things that causes the emmissions into the atmosphere; and how to calculate the pounds locked up versus pounds emitted, I think, would be challenging, but I bet (which means that I do not know), we lock up more than we emit.