Greenhouse gasses, Carbon Dioxide, Water Pollution and Air Pollution and Wildfires
Pillow Talkin by Lil Dicky explains it all
The answers is all of the above
The molecules doesn't need energy to cross through.
The diffusion doesn't need protien, the molecules pass between phospholipids by passes protien. It moves smaller molecules. Facilitated need protien also hormone, and larger molecules.
I wish it makes sense.