Don't worry my fellow downtown New Yorkers there will be another Superstorm long before you drink CO2. That will be the final nail in the floatsom for you. If that does not happen a tsunami will. While we are all waiting for the demise you will likely have many power outages this summer due to the overuse of AC and all the nasty things that go along with over heating the BOD.What we normally forget when talking about the amount of CO2, is the significance it has for the human (and other creatures) health. Above 425 ppm in the atmossphere the healthproblems will become more servere, because the blood will slowly be more acid. This will affect bloodpressure etc.
BTW: President Johnson was informed in 1965 about the dangers in increasing the amount of CO2.
Hav a nice day