Today, about 7.4 billion people call earth their home. By 2050, population is projected to reach 9.7 billion. For 2100, the projection is 11.2 billion by 2100 (UN DESA, 2015a, p.3).
In 2016, the number of people is growing by about 80 million people per year, 200,000 per day, 9,000 per hour, 150 per minute and 2.5 every second. To visualize the accelerating growith in the past two thousand years—and into the decades ahead—take five minutes to watch this video.
World Population & Environment: 1 C.E. - 2050
Growth in human population growth is mainly a product of declining mortality from improvements in food production, medication and sanitation, and energy sources.
Populations were nearly stagnant until the end of the Stone Age and the dawn of agriculture. By 8,000 BC, communities had the means to sustain larger families and their populations expanded. The only growth blip since then happened in the 14th Century when the Black Death devastated populations in European countries. By the start of the Industrial Revolution, new technologies and cheap fossil-fuel energy spurred an unprecedented boom in population growth.