Q: How does Earth Pulse know the world population right now?
No human organization conducts a planetary headcount on a daily basis. Instead, national censuses, birth registrations, and death certificates are compiled by the United Nations Department of Economic and Social Affairs (UN DESA).
By calculating the verified net arrival rate (roughly 4.25 births and 1.90 deaths every second), our mathematical model advances the population count smoothly forward for every millisecond elapsed since the baseline census snapshot.