Demographic Trends - Population collapse is a real concern [1] - Birth rates are consistently declining [1] - Historically, declining birth rates have led to civilizational decline [1]

Demographic Trends - Birth rates are plummeting in many countries [1] - Population collapse is a significant threat to civilization [1]

Demographic Trends - Population collapse is identified as a significant threat to the future of civilization [1]

Demographic Trends - Population collapse is identified as the biggest threat to humanity [1]

Demographic Trends - Birth rates are plummeting in many countries [1] - Population collapse is considered the greatest threat to civilization [1] - Change is needed to save humanity [1]

Demographic Trends - Population collapse is a major risk to the future of civilization [1]

Demographic Trends - A fertility rate of 2.7 children per woman is now considered necessary to avoid long-term population decline [1] - The current U S fertility rate is 1.66 children per woman [1] - Many wealthy nations have even lower fertility rates, such as Italy at 1.29 children per woman [1] Population Sustainability - A minimum of 2.7 children per woman is needed for population survival [1] - The current fertility rates are insufficient to maintain the population [1]

Birth rates are plummeting in a lot of countries. Population collapse is the greatest threat to civilization. https://t.co/TRywIBKCM9 ...