 Question three, we're asked to evaluate whether or not reducing the population limit or reducing our use of coal has a bigger effect on emissions again in the year 2100. So right here I have the standard control case in blue that was, this is from question number one, and then also question number one is this magenta curve. This shows what would happen if we reduced coal according to the parameter setup here. Now we want to turn that switch off and instead adjust the population limit so that it's 10. So I move that knob until I see a 10 appear there, then I can run the model again. Now we're not going to change the proportions of fossil fuels that we're already using. The only thing that's going to change here is what the total population is and we'll see what the effect is. And we run the model and we see okay here in this case in the year 2100 the emissions are much closer to the kind of business as usual do nothing scenario here and quite a bit more than the emissions that resulted from reducing our use of coal. So in this case reducing the fossil fuels has a much bigger impact on emissions than reducing the population. Now you could lower the population even more, what if we dropped it all the way down to seven point something and we ran it again? We'd see that you see a further reduction in the emissions but it's still above what you have for the reduction of coal in this case.