As of 1973, the US had a population of 210 million people, who are increasing decreasing by 0.8% per year. Outside our Lifeboat, let us imagine another 210 million people say that combined populations of Colombia Ecuador, Venezuela, Morocco, Palestine, Thailand and the Philippines who are increasing at a rate of 3.3% per year. Put differently, the doubling time for this great population is 21 years, compared to 87 years for the US why does the author present these statisticsc