Im currently writing a story set in the distant future. 99 percent of the human race has vanished due to warfare and economic downfall. The 99 percent would be of the total number of the population when they were at their peak. So for the sake of argument, lets say that the human race reached their peak 200 years from now. What would be the estimated size of the population during that time according to what is known now? The story takes place about 5,000 to 10,000 years after that peak. Would that be enough time for earth to cover up most of the traces of our civilization or should I go further into the future? Im talking dense vegetation, crumbled cities, depleted resources and extreme climates. I want a very good portion of the lands to be ruled by large, evolved animals who would stump mankind from exploring too much. The same goes for the sea. How long would it take for animals to evolve, nature willing, into such extreme lifeforms? Would it be possible or required that mankind evolve along with these creatures? The story will take place inside a huge city where mankind has survived for so long but have not progressed. They have energy and food resources , limited but advanced technology and a governmental system. There will be several cities of this nature which will all be isolated from eachother. Should mankind evolve, would this isolation cause each civilizations evolution to take extremely unique paths from eachother? I know these may be simple questions but I am no expert in this area and I just need a little help to maintain the accuracy of my story. All replies are appreciated. *If any of this sounds familiar, know that I have had this idea for quite sometime and will attempt to root out most similarities to any other current books or movies.