Technology and other means of transportation.
It might increase if humans do not kill them
Urbanization
too many automobiles
During the summer, the reason that cities are often hotter than nearby fields and parks is quite simple. Cities have buildings and the buildings trap heat between them, while fields have no way of trapping the heat.
During the Mogul Empire
(Apex) Increase in urbanization.
increased in urbanization
sexual reproduction
Women that are in menopause can see an increase of abdominal fat. This is caused by deficiencies in the hormone estrogen.
increased growth in towns and cities
World War 1
It is caused by the neurohormone called norepinephrine.
there was suddenly more land available
They needed government officials To increase farming For Sumerian influences To increase the population
Coal caused health problems because it was used extensively in the cities in factories and houses. Emissions included sulphur and nitrous oxides which polluted the air and caused asthma, bronchitis and lung disease.
They noticed cities full of dead people. black death caused cities near trade route to suffer greatly.
Because so many people had to move to the cities due to the enclosure acts. The jobs were in the cities, so the people followed the jobs.