 Today I'm going to show you how to get the answers to questions 10 through 12 on the assessment. And this is where we kind of step back and consider all these different options, these three basic options to gather and compare them. And in the first one, we kept the temperature close to about a two degree warming by the end of the model run by energy conservation and increased reliance on renewable energy. The next one, we achieved that same temperature level approximately through geoengineering and direct carbon removal. In the third case, shown in the blue here was the sulphate aerosol geoengineering. So the question is, for 10, which of these three scenarios is the best from an economic standpoint? There are lots of different ways of looking at the economic performance of each of these three. But I think the one that sort of sums it all up best is this total costs per capita. So these are costs per person that we're going to have to pay for producing the energy and the consequences of producing that energy in the form of climate change or moderating it in terms of geoengineering costs. And you can see the two geoengineering cases here are pretty close to the same 9.3 and 9.2 thousand. The conservation scenario and renewable energy one is considerably less expensive. So 2.4 thousand per person compared to nine. So that's the clear winner. So that's answer A for 10. 11 asks, which of the three scenarios is best from an ocean pH standpoint? And so here we have to look at graph page number two. And these are shown in different scales. This just shows the pH for the last one, the conservation one. And that was at 8.06. And if you remember from before, that's about the same close to the same that we got with the DCR geoengineering. So those two are about the same sulfate geoengineering. The pH got down to 7.58, which is really a pretty dramatic acidification of the ocean. So that's the worst by far. Conservation and renewables are close to the same. There's not a clear winner. So the best answer is D, which is A and B are about the same. And the last question in the assessment 12 asks from an overall environmental and economic standpoint, which of the three scenarios is the best? Well, as we saw in terms of pH, the conservation of renewables and the DCR geoengineering are about the same. In terms of temperature, they're all more or less the same by the time we get to the end of time. Although, you know, you could say that the conservation and renewable approach here kept us at a lower 10 temperature for more of the time. So that might be preferable in that sense. But then the other thing, the economic standpoint, as we saw before, this conservation and renewable scenario shown here in green, that's the clear winner. So if you take all these things together, the conservation and renewable scenario is the best overall from an environmental and economic standpoint. So that's answer A on the assessment. And that's the correct answer.