CO2 isn't the only has used; all hydrocarbons in the atmosphere can be sequestered, though CO2 is the primary source. And I agree with you: red meat is actually good for you, high cholesterol doesn't cause heart disease (actually protects against it), and saturated fats are also good for you. Why did indigenous cultures make butter for millennia if it was bad for them? Our ancestors weren't idiots and they knew which foods were nutritious and healthy.