Prof Martin Bell
Prof Bell is a population geographer at the University of Queensland.
Ross Gittins is economics editor of The Sydney Morning Herald and an economic columnist for The Age. He says rapid population growth increases overall growth domestic product, but does little to increase individual wealth.
Patti is a lawyer in Perth, WA. She migrated in 1973 and thinks Australia has the capacity to handle a bigger population.
Businessman Dick Smith thinks Australia must curb its population growth and says the Australian way of life is under threat. He believes rapid population growth could eventually lead to a lack of food and starvation.
Thobekile migrated to Australia in 2008 on a skilled migration visa. She is currently sponsored by Jo and Greg Fleming to work on their dairy farm in Finley, NSW.