As panic theory, this text is high art. Crunched for maximum alarm-intensity:

There are a lot of very lethal viruses in the world, and Ebola is not the most lethal or most easy transmittable, but the main thing which makes me worry about it is the steadiness of its exponential infection curve. … The main stunning feature of it is that the curve is moving straight forward (small downward bump in May-June may be explained by the efforts of existing medical services in Africa to curb the epidemic before services had been overwhelmed). This exponential growth must be stopped, or humanity will face a global catastrophe, and it may start a downward spiral towards extinction; moreover, some estimates suggest that pandemic doubling time is actually two weeks (because of underreporting of actual cases), so in five months, seven billion will be infected: total infection, by July 2015. … Such catastrophes may not mean total human extinction, as only around 70% of people infected currently die from Ebola (and even less because we don’t know, or share, asymptomatic cases), but still, this means the end of the world as we know it. This virus is the first step towards the road of full extinction … If the virus will mutate quickly, there will be many different strains of it, so it will ultimately create a multi-pandemic. … Some of the strains may became airborne, or have higher transmission rates, but the main risk from multi-pandemic is that it overcomes defenses provided by the natural variability of the human genome and immunity. (By the way, the human genome variability is very low because of the recent bottle neck in the history of our population. …) … We are almost clones from the view point of genetic variability typical for natural populations. […] The Human race is very unique – it has very large population but very small genetic diversity. It means that it is more susceptible to pandemics. […] Also, a large homogenous population is ideal for breeding different strains of infection. … If the genetic diversity of a pathogen is bigger than human diversity, than it could cause a near total extinction, and also, large and homogenous populations help breed such a diversity of pathogens feeding on the population. … [embedded link] … “The Ebola virus can survive for several days outside the body” [link] … “It is infectious as breathable 0.8 to 1.2-μm laboratory-generated droplets” … “Also many of the greatest plagues mankind has ever known were not airborne: e.g. smallpox.” …

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John Michael Greer muses on the topic of Ebola (in a typically luxuriant post, ultimately heading somewhere else):

According to the World Health Organization, the number of cases of Ebola in the current epidemic is doubling every twenty days, and could reach 1.4 million by the beginning of 2015. Let’s round down, and say that there are one million cases on January 1, 2015. Let’s also assume for the sake of the experiment that the doubling time stays the same. Assuming that nothing interrupts the continued spread of the virus, and cases continue to double every twenty days, in what month of what year will the total number of cases equal the human population of this planet? […] … the steps that could keep Ebola from spreading to the rest of the Third World are not being taken. Unless massive resources are committed to that task soon — as in before the end of this year — the possibility exists that when the pandemic finally winds down a few years from now, two to three billion people could be dead. We need to consider the possibility that the peak of global population is no longer an abstraction set comfortably off somewhere in the future. It may be knocking at the future’s door right now, shaking with fever and dripping blood from its gums.

The eventual scale of the Ebola outbreak is a known unknown. A number of people between a few thousand and several billion will die, and an uncertain probability distribution could be attached to these figures — we know, at least approximately, where the question marks are. Before the present outbreak began, in December 2013 (in Guinea), Ebola was of course known to exist, but at that stage the occurrence of an outbreak — and not merely its course — was an unknown. Before the Ebola virus was scientifically identified (in 1976), the specific pathogen was an unknown member of a known class. With each step backwards, we advance in abstraction, towards the acknowledgement of threats of a ‘black swan‘ type. Great Filter X-risk is a prominent model of such abstract threat.

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Elon Musk (in conversation with Ross Andersen) ponders upon the Fermi Paradox:

We might think of ourselves as nature’s pinnacle, the inevitable endpoint of evolution, but beings like us could be too rare to ever encounter one another. Or we could be the ultimate cosmic outliers, lone minds in a Universe that stretches to infinity.

Musk has a more sinister theory. ‘The absence of any noticeable life may be an argument in favour of us being in a simulation,’ he told me. ‘Like when you’re playing an adventure game, and you can see the stars in the background, but you can’t ever get there. If it’s not a simulation, then maybe we’re in a lab and there’s some advanced alien civilisation that’s just watching how we develop, out of curiosity, like mould in a petri dish.’ Musk flipped through a few more possibilities, each packing a deeper existential chill than the last, until finally he came around to the import of it all. ‘If you look at our current technology level, something strange has to happen to civilisations, and I mean strange in a bad way,’ he said. ‘And it could be that there are a whole lot of dead, one-planet civilisations.’