1. Under an electron microscope, an atom would appear like a solar system. A grain of sand would strongly resemble a galaxy. There would be clusters of nuclei around which revolve electrons, with large spaces in between.
2. With respect to global warming, you have fallen into the concensus science trap. There is evidence to show that our planet has indeed warmed over the past 100 years, but that the cause is anthropogenic CO2, is far from certain. Increased solar activity + cosmic rays reaching our atmosphere account for something like 95% of global warming. The greenhouse proponents constitute a lucrative political “concensus” viewpoint that many atmospheric scientists reject . For starters you might look at
Still Waiting For Greenhouse and search for papers particularly by Landscheidt, and Svensmark and Baliunas.
AndyA