How humans populated the earth?

Why do some scientists think that global warming would increase the strength of hurricanes? Why have greenhouse gases increased so much in the past 100 years? What happens to a fluid when the temperature increases? How do you convert 389 K to Celsius? How are diamonds found and taken from the ground? How do you calculate concentration of phosphoric acid? At what temperature does household ammonia freeze? What topographic map that may show a hill with a volcanic crater is? How much snow can fall during a blizzard? When it is spring in Europe what season is it in the United States? What countries experience 4 seasons? What causes erosion on earth's surface? What computer industry has caused growth in population and prices in this states silicon valley? Particles outside the Earth's atmosphere are called? How can we prevent wastage of water in school? What are the plates of the lithosphere? Is hydrogen highly explosive? What is the chemical formula of diammonium hydrogen phosphate? How can scientists tell if a flood is going to occur? Which is the best reason for the difference between the properties of diamond and graphite?

How humans populated the earth?