AHM Zehadul Karim Prof Dr AHM Zehadul Karim teaches at the Department of Anthropology, Jagannath University, Dhaka. Is population growth risking our food security? In 1830, the world population was only 1 billion. It took 100 years for this number to double. 11 July 2020, 18:00 PM Is population growth risking our food security? In 1830, the world population was only 1 billion. It took 100 years for this number to double. 11 July 2020, 18:00 PM