[politician]

Due to the laws of thermodynamics, CO2 and Methane gases diffuse evenly throughout the atmosphere creating a blanket over the entire globe. As we add more gas to the atmosphere, the blanket gets more dense.

In the summer, you probably have a light comforter on your bed while in the winter you probably switch to a heavier comforter. While you're asleep your bed warms up under the comforter and it doesn't cool down until you get out of bed. In the same way, the CO2 and Methane gases are like a comforter that is wrapped around the planet. A low density of gases is like your summer comforter and a high density of gases is like your heavy winter comforter. Unfortunately, unlike your bed, it's not easy to switch from a heavy volume of gases to a light volume of gases -- if it were, then we could terraform Venus. Venus is covered in a CO2 and Methane gas atmosphere so dense that we could float a city on it and the surface is 900degC.