 coal, and we also talked about what they are made up of, primarily carbon, hydrogen, nitrogen, sulfur, and other minerals. And we need to know what forms, when these carbon, hydrogen, nitrogen, sulfur, and other minerals burn, and they are primary combustion products. Primary combustion products are basically what forms when an element reacts with oxygen. So primary products are carbon dioxide, carbon monoxide, hydrogen, and water, sulfur dioxide, nitrogen oxides, and lead, when we used to use unleaded gasoline. And you also need to know how each of these are forming, like carbon dioxide, how does it form, carbon monoxide, when does it form, how does it form, and which are the sources that emit most of these carbon monoxide, sulfur dioxide, et cetera, et cetera. Secondary pollutants and difference between primary and secondary pollutants. You must be careful about that. Secondary pollutant is a pollutant that forms after primary pollutants are released and they react amongst themselves or something in the atmosphere and form secondary pollutants. And similarly particulate matter, you know, what sizes they form, how they form, when they form, et cetera. And you also need to know the health and environmental effects of each of these pollutants like CO2, CO, SO2, et cetera, all these pollutants, health and environmental, what concentrations and what concentrations, you don't have to remember the numbers or anything. But how does it affect us? And which are the sources that emit these things, as I said. And particulate matter is PM, and it is classified based on size, and which size, you know, particles, how they are classified, which size are most dangerous, as you can see, intermediate sized particles are the most dangerous one between 0.1 micron and 2 microns in size. And also the regional effects of these particles, we need to concentrate on. Global and regional effects, for example, CO2 causes global warming or sort of global climate change, and SO2 and NOx causes acid rain, et cetera, et cetera, all right. And greenhouse effect, what is it basically, you know, what is greenhouse effect definition or precisely, you know, what happens. And which are the gases that contribute to greenhouse effect? These are the gases that contribute to greenhouse effect, you need to know these. And some of these gases are more powerful than the others, so you need to understand what is global warming potential or GWP. And you need to go through the textbook or your notes about CO2 and temperature profiles, you know, how they changed in the past, in 150 years, and even before that. And what are the reasons for those changes? And as we talked about in the textbook, basically, you know, what is responsible for these kinds of changes? And pre-industrial concentration and concentration right now, what it is and reasons for concern. And you also have to think about natural causes. Some people argue that it is happening naturally, so you need to know what are the arguments that are made for natural as well as human-made changes. Global warming, what is it? And difference between greenhouse effect and global warming and factors affecting global climate change. What happens? What happens when global climate changes, you know, global temperature changes and sea level changes. And polar ice gaps melt and precipitation levels change, you know, precipitation generally increases because there is more cloud cover. And also what is for certain, what is for not certain and feedbacks, feedbacks are like, you know, when low-level clouds form, it can increase actually the, it can reflect the sunlight actually, increase this fraction of sunlight that can penetrate the thick clouds. And so the planet might be cooling down. And if the higher-level clouds form, it may be warming up. So those are the things that we don't know yet completely, you know, what kind of clouds form. So uncertainties and certainties, for example, the great ocean belt conveyor phenomena and so on and so forth. And you also need to know what you can do to reduce potential global warming, individual steps. When I say individual steps, you need to really know which gas, by which step, which gas is reduced, not just list those five steps or six steps that you know of, you know, drive less. That's not an answer. By driving less, I'm going to produce less CO2 because gasoline when burned produces CO2 kind of thing. You know, you have to go to the reasoning part. And acid rain and ozone, acid rain and ozone, how they form, basic chemistry you need to understand, basic, you don't have to write balanced equations, but what goes into it and how these, under what conditions these things form. And the gases that are responsible and conditions under which these things form, the difference between wet deposition, dry deposition, and how we measure acid rain on a pH scale, you know, what is acid, what is alkaline or basic, how we measure pH, and also the effects of these acid rain on various things, effects on human health. When we breathe SO2 NOx, what happens or what happens when acid rain falls on soils to vegetation and aquatic life. For example, fish cannot survive at lower pHs and so on, it's a different species. And effects of visibility because acid rain components can form, fine particulates which can reduce visibility, and different materials that we care about like monuments, etc., statutes, etc. You need to understand those differences. And ozone, ozone basically two types, good ozone and bad ozone. So you need to understand why this is called good ozone, why this is called bad ozone. This good ozone shields us from UV light and because it's far away in the stratosphere and this should be stratosphere, not troposphere here. And global ground level ozone, ground level ozone is formed by NOx and VOCs reacting in presence of sunlight, you know, and why we call this bad ozone, why we call this good ozone, and ozone hole, what is it, you know, why is this really a hole or what is that ozone hole, why we call that ozone hole when the concentration goes down, below a certain level it cannot shield us from the UV rays that are coming from the sun. So we call that an ozone hole. And how we are destroying that ozone and causing depletion of ozone. And causing the problem of more UV rays coming in. And also you need to understand at the ground level, you know, how the ground level ozone is forming and what turns into photochemical smog, basic chemistry, what are the reactions that are going in. You don't have to actually balance the reactions or anything, but you need to understand the conditions and what are the reactants that are involved in it. And health and human, you know, on health and environmental effects, for example, ground level ozone can cause human health problems and also it can cause.