Climatologists warn of a tipping point when global temperatures trigger catastrophic events and sea levels rise more than 50 feet. what would cause the sea level to rise so greatly? increased precipitation over the continents melting of the greenland ice sheet thermal expansion of the oceans melting of the polar ice cap

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]