What would happen to earth's atmosphere if there was no wind?

There have to be no sun for there to be no wind, but if somehow we where able to have sun, and remove wind, while there still was air, then all the trees would die, and all life on the planet would cease to exist, as the wind carries carbon atoms from animals and human beings across forests, and carries oxygen from greenery to animals and humans.

Human beings breathing in their own CO2, and trees breathing their own O2 would kill it all.

There would be no cars neither, and no cities, as it would become very difficult to find oxygen in crowded places and cities!

If there where no wind, and despite that greenery and humans would still be able to survive, then there would be no clouds, and the earth would still become barren as no more rain would enter the lands, and all the water would end up in the ocean.

But even if humans somehow could irrigate the whole earth, certain places would become very hot, or very cold, as there is no breeze to provide comfort, and certain places as we know it now would spontaneously combust in a fire because of no cooling air (think of savanna areas, large forests, grass lands, etc).