However, if you do add 8 women, you could conceivably get 1 baby per month for nine months.
think of it like this: you are quite obese from a lifetime or poor eating habits. you know that your chances of health problems are far higher than if you were in better shape. it's not guaranteed, but you know the risk is there. you also know that you have two methods of shedding pounds: excercise and eat healthy (i.e. lower CO2 emissions) and surgery/medication (geoengineering). Surgery can reverse your condition temporarily, but if you don't cut down on the mcdonald's and go out for a jog every now and then, you'll just end up back in the same place a few years down the line.
this is pretty much the same thing. geoengineering can help cut down on atmospheric CO2 levels, it can change various weather systems, lower the overall temperature of the earth, but if we keep doing what we're doing, we're just going to end up back where we are now, and eventually no amount of liposuction will ever get rid of your man-boobs.
Scientists will study your brain to learn more about your distant cousin, Man.