How many humans would it take to repopulate the earth?
What is the minimum viable population for humans to repopulate the Earth?
How long will it be before the earth will not be able to sustain the human population? Can planet Earth sustain a human population of 100 billion? How long can earth sustain humanity? How many people can the Earth support while maintaining a clean, green ecosystem? How many human beings have lived on this Earth since the beginning of the time? What percentage of the Earth's population is considered genius? Is the total number of living organisms on Earth going up or down? What factors affect it? If extra terrestrials attacked the Earth would humans stand a chance of repelling them? How would earth be different if humans had an average lifespan of 200 years? Is it possible for any planet to sustain life? How's the world's population determined? How is the world's population estimated? What is the least genetically diverse human population? How much of the earth has not been physically discovered by humans? What percentage of the world's population lives in developed countries? Is it possible to make the Earth a single country? Which country has the least genetically diverse population in the world? How long is the human race likely to survive? Can the planet "do dinosaurs again"? How many people lived on earth? If we had to cull the population. Which continent would we have to start with, and why? What percent of the world's population live in developed countries? What percentage of the world's population lives in developing countries? What would be the outcome of extra mass on earth? Will Earth always be habitable for us humans? What are the chances that earth is the only habitable planet in the universe? What percentage of the world's population lives in under developed countries? What is the estimated age of mankind on earth? How much of the total biomass of earth are humans? What is the most useless animal i.e. one whose extinction would have the least impact upon the world? (Please don't say 'humans') What will be the scenario if humans disappear from earth?