I’m not a scientist, but believe my BHS Physical Science classes and common sense bears a little weight here. Sunlight and our distance from the sun is the only source of planet heat. How much of that sunlight reaches our surface determines our temp. We can use darkness and cloud shade as examples here. We cannot change our darkness and cloud cover frequency because it is a given norm, but we can learn from them that both, darkness and shading cause lower surface temps. We have also learned that large meteorite strike dust has blocked sunlight and thrown our planet into ice ages. I also believe the planet has been getting warmer since the industrial revolution. I have even noticed this in my lifetime of 57 years. Since the height of the industrial revolution, the economically developed countries have made great progress in taking steps to clean the air. We have pics of how dirty and dusty our air was not long ago from man made causes. Through extensive firefighting efforts, we have also cut down dramatically on the amount of land lost to wild fires. Natural fires use to take thousands of square miles of forest, causing great atmospheric dust. We have also reduced dramatically the burning of fossil fuels. Given all the steps we have and are taking to reduce atmospheric particles/dust, which retard direct sunlight from reaching and warming the earth, isn’t at least part of the warming of the earth/climate change a natural and direct man made result of our cleaner air efforts? I believe so.