The Population of Planet Earth over the Past 12,000 Years
The chart below tells a fascinating story. It begins in 10,000 BC and charts estimates of the Earth's human population up to the year 2000. The population from 10,000 BC up to about 2000 BC was low and remained stable, according to these estimates. Then, it began to rise very slowly. Likely, that was because civilization and agriculture was beginning to develop, which allowed more people to survive. Using figures from other sources, I can supply some numbers. In the year 1 CE (AD), the global population was roughly 300 Million. China and the Roman Empire dominated those data. It's worthy of note that the total population of the United States in 2018 is close to 320 million.
1 CE is in the midst of the Iron Age. Growth continued at a slow rate until about 1000 CE, and then started to accelerate. Agriculture, civilization and technology were developing at that time, allowing more people to be fed and survive. If you look at the right side of the chart, you will notice a hyperbolic rise of population that coincides with the very beginnings of science, trade, and industry in about the middle of the second millennium. Once industry was widespread, the population figures spike sharply up, accelerating at an astonishing rate. Today, we have about 7.2 Billion people inhabiting this planet. Going from 300 Million to 7.2 Billion in just 2000 years is mind boggling.
When will we hit 8 Billion? Estimates vary, but it's expected around 2025-2030. The growth curve is almost vertical at this point in human existence. Will it slow down? Perhaps. Some models show it leveling off and stabilizing at about 10 Billion. Why? Because there simply will not be enough resources. One model shows population beginning to fall not long after that. We can't predict, because we don't know the future.
Look at this chart. Try to wrap your mind around what it represents. We are living in the times of peak human population. The current growth rate is unsustainable. It is a problem.
Chart Source: https://en.wikipedia.org/wiki/World_population_estimates
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And it still isn't understood very well."Wait - You want to put what where? I don't know..." 
Nope. I guarantee it was earlier than that...
Although not by much....
I think some republican congressman made that claim! 
Since 10,000 BCE the world's wild animal biomass has decreased from about 300 million tonnes to under 20 million tonnes, while the biomass of domesticated animals has increased from 0 to 1400 million tonnes. And the biomass of human beings has gone from about 200,000 tonnes to 400 million tonnes.
Our numbers and our needs have destroyed the planet. There is no going back.
I bought that bumper sticker near the turn of the century. Here's an article on population doubling. It would be interesting to see a second pie chart based on consumption levels.
By Deborah Byrd in HUMAN WORLD | SCIENCE WIRE
October 12, 2017
snip...
In only 40 years, the world population had doubled. In 100 years, it had quadrupled. In only 12 years, it had increased by one billion. Median projections for population growth estimated that by the year 2050, the tally would top 9 billion, with an increase of roughly 77 million people per year.
Several years ago in a local paper there was a LTTE expressing concern about human population & a few weeks later a response saying that people who are so concerned about human population should move to Wyoming. "There's plenty of room there!"
It is the same type of thinking of climate change deniers. "If global warming is true then why is it snowing?"
