Years elapsed Total population billions Population 1 2 Year 11 10 9 4 3 2 1 World population milestones in billions 0 9 1804 1927 1959 1974 1987 1999 2011 2026 2042 123 32 13 12 12 15 16 T 2 billion 1928 15 7 billion 2010 6 billion 1998 O 5 billion 1986 3 billion 1959 4 billion 1973 O 9 billion 2037 8 billion 2022 1800 2022 estimates Median projection 80 prediction interval 95 prediction interval 1 What is the trend shown in time needed to add another billion to the human population 2 Why is causing the trend to behave the way it does 3 Identify describe 3 ways the trend in human population growth especially since the 1970s negatively affects marine populations