How many people was the earth "designed" to support?
How many people can the Earth support while maintaining a clean, green ecosystem?
What is the minimum number of people necessary to repopulate the earth without interbreeding issues? What is the minimum viable population for humans to repopulate the Earth? If nearly everyone on earth died for some reason. How many people would be needed to repopulate earth without any inbreeding effects? Can planet Earth sustain a human population of 100 billion? How many humans would it take to repopulate the earth? How long can earth sustain humanity? Can two people repopulate Earth? Is it possible? How does the greenhouse gas effect increase our ecological footprint? How can we reduce the effect? What percentage of the Earth's population is considered genius? How do you see the role of mankind within the Earth's ecosystem? How come the world is not more environmentally conscious? Why as a human race are we not being more progressive to preserve our planet? Is the total number of living organisms on Earth going up or down? What factors affect it? How much of the total biomass of earth are humans? How do we live a green life? What is important for a water ecosystem to remain healthy? Why are our ecosystems important? What are the 5 natural resources of Earth that are used to meet the basic needs of human civilization? Why are they important? How long will it be before the earth will not be able to sustain the human population? Why is reducing individual and societal ecological footprint necessary and important? Do humans add any value to the ecological system? How can I help the world notice the benefits of biodiversity? Will Earth always be habitable for us humans? Can agriculture affect the environment? If so, how? Is it possible to make the Earth a single country? Why don't environmental organisations in the US and the world talk about how animal agriculture contributes to 51% of global warming? Can special greenhouses be built in Antarctica so that the people living there can grow their own food? What are the biggest problems with sustainability and the environment right now? Ecology: Which environmental factors increase biodiversity? Can we produce oxygen like trees and reduce global warming? How do you live a green life?