Nature Thoughts

Okay so everybody has heard of the ending of the world. Whether it's from the Bible or from scientist. The science version of when everybody dies, the nature life will once again take over. The one thing I can't understand is how will every plant survive. In school we learn that plants need carbon dioxide in the photosynthesis process. We breathe out carbon dioxide as plants gives us oxygen. When we all are dead who will provide that. Will carbon dioxide will still remain in the air? This is like one of the few question I would like to answer with science. You see I dislike science, so I would probably fall asleep looking for answers. If you know the answer feel free to share.