EDIT: Nice silent edit there. Let me just quote what you just deleted from your comment "Since they won't probably give in voluntarily and since many of them are already in power, this further implies a violent uprising."
If you're going to troll, at least get your science right. Breathing out CO2 adds zero net CO2 to the atmosphere, because it comes from food you ate, which itself came from CO2 in the atmosphere.
The oil and gas that an individual uses to survive, on the other hand, is literally deadly. So you are at the verge of having a point: we could lower CO2 usage by killing people.
However, a much more direct and reasonable fix to the problem is to disincentive the use and production of that particular poison. There are a couple ways to do this, but I'd argue a steep carbon tax, with proceeds used for funding sequestration research and programs, is the most humane solution to the monstrous evil of carbon pollution.
For most of us that food probably took a considerable amount of fossils food to grow, package and transport.