" Feels like déjà vu all over again."

It seems like just yesterday that I was warning about the threat of viral pandemics on an overpopulated, interconnected planet.

In fact, the year was 2014, at the time of the last horrific outbreak of the deadly Ebola virus in Africa, which went on to kill thousands. The first ever case of this lethal disease had just been diagnosed in the United States.

Back then, I wrote words that could almost have been penned again just yesterday:

Just substitute "China" for "West Africa."

Even earlier than that, back in 2009, I warned in a radio interview during the Swine Flu epidemic that:

Understandably, no one listened to me, an obscure environmental scientist and blogger. But you would think they'd have paid more attention to the prestigious and well-connected Rand Institution in 2012 when it warned that pandemics were "capable of destroying America's way of life."

Or maybe U.S. authorities would have and should have been more inclined to lend an ear to Microsoft founder and mega-philanthropist Bill Gates , richest man in the world for much of the past two decades, when he warned in a 2005 TED talk that the greatest risk of a global catastrophe was "not missiles, but microbes."

Gates re-issued his warning in another 2015 TED talk called "The next outbreak? We're not ready," now viewed by more than 18 million on YouTube .

The first lesson of the 2020 coronavirus/COVID-19 (SARS-CoV-2) pandemic for Americans and most other nationalities is how little heeded warnings of such predictable catastrophes are – even when amplified by reputable, prestigious sources with large public platforms and considerable megaphones.

Most ordinary folks are just too caught up in life's day-to-day travails and pleasures, and most public officials too busy in putting out fires. Thus, neither heeds dire warnings of some sweeping disaster that might (or might not) happen over the next decade (even though it's inevitable over the next several decades or century) or to invest adequately in preparedness for the future. They (we) all ignore the Boy Scouts' motto to "be prepared," and they (we) do so at our common peril.

The second lesson is that we are in part a victim of our own technological and scientific hubris In the 1950s, dazzled by the stunning advances of antibiotics and vaccines in conquering humanity's ancient microbial enemies, some in the medical profession had the audacity – now perceived in hindsight as incredibly naïve – to prophesize the imminent elimination of all infectious diseases from the world.

This led to a certain complacency on the part of society, when all along scientists knew that, 1) nature abhors a vacuum; 2) nature is dynamic, not static or stagnant, and 3) organisms evolve. The moment we began throwing antibiotics at microbial bugs was the very moment they began evolving resistance to them. Feeding antibiotics to increase the growth (and profitability) of livestock destined for our dinner tables was not an optimal long-term strategy to manage and integrate food production and public health.

Third, zoonotic diseases – those caused by viruses, bacteria, or parasites that can spread from non-human animals or wildlife to human beings – are a major threat to Homo sapiens . Some 75% of emerging infectious diseases we face are believed to come from animals . These include the coronavirus at the center of the current pandemic.

This is an incredible irony, because the big picture is that humans and our domesticated livestock (e.g., cattle, pigs, sheep, chickens) are literally taking over the planet.

As shown in the diagram below from the UK group Population Matters, based on the research of University of Manitoba ecologist Vaclav Smil, some 10,000 years ago, just before the advent of agriculture, if one added up the weight of all the land vertebrates then living on Earth, the combined population of human beings comprised about 1% of that total weight, or biomass.

Back then, prior to the Agricultural Revolution, there were no livestock.

Nowadays, in stark contrast, humans comprise some 32% of the total terrestrial biomass, and our livestock another 67%, for a total of 99%. In essence, we have replaced all but 1% of all wild birds, mammals, amphibians, and reptiles with ourselves and the domestic animals that we maintain to feed us.

At the same time, humans have spread diseases to remaining wildlife populations around the world, including the fungus that causes White-nose Syndrome, which has wiped out tens of millions of bats in eastern North America, and chytridiomycosis, the lethal fungus causing a precipitous worldwide decline in amphibian populations. The tiny golden toad of Costa Rica's cloud forests succumbed to the chytrid fungus only a quarter century after science first discovered and described it.

Costa Rica's golden toad, last observed in 1989 and officially declared extinct in 2004

Yet paradoxically, even as wildlife is indisputably disappearing from Planet Earth because of human overpopulation, we humans seem to be more than ever at risk to the diseases they carry. Several factors account for this.

One factor is the cruel "wet markets" that are widespread in China and other Asian countries, where farmed and captured wild animals such as bats, snakes, and pangolins are kept confined in crowded and unsanitary conditions prior to their slaughter, often right in front of a customer. These hellholes for hapless animals – where the blood, guts, and feces of myriad creatures are intermingled – have been called incubators of zoonotic diseases like the coronavirus.

A "wet market"

Two other factors are the growth in human populations and the increase in human population density. In their 1968 classic, The Population Bomb , biologists Paul and Anne Ehrlich warned that overpopulation often breeds the high population density and unhygienic living conditions that facilitate the spread of a wide variety of contagious infectious diseases.

In the context of the current crisis with the novel coronavirus SARS-CoV-2, The New York Times referred to New York City's density as its big "enemy" in the fight against the coronavirus, which propagates readily when people are in close proximity to one another.

A final factor is one that NumbersUSA supporters are all too aware of: i increasing rates of migration and mobility. In Vaclav Smil's fascinating 2019 MIT Press book Growth: From Microorganisms to Megacities , which Bill Gates calls "Vaclav Smil's latest masterpiece," the master ecologist writes that during the "Spanish" flu pandemic a century ago:

The current pandemic is perhaps the inevitable outcome of an unprepared, globalized, borderless, overpopulated world. Let's hope that we'll learn from the lessons cited here, which are about more than the merits of additional social distancing, ventilators, hospital beds, and personal protective equipment (PPE).

In addition to all the obvious medical measures, more than ever the world needs borders, population stabilization, and more ethical approaches to our non-human neighbors on this ever smaller planet.

LEON KOLANKIEWICZ is the Scientific Director for NumbersUSA

Share these videos all over America:

In a five minute astoundingly simple yet brilliant video, "Immigration, Poverty, and Gum Balls", Roy Beck, director of  www.numbersusa.ORG, graphically illustrates the impact of overpopulation.  Take five minutes to see for yourself:

http://www.youtube.com/watch? v=LPjzfGChGlE&feature=player_ embedded