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One class of argument about likelihood stems from the history of pandemics, where the limited size of historical pandemics is evidence that larger pandemics are unlikely. This argument has been disputed on several grounds, including the changing risk due to changing population and behavioral patterns among humans, the limited historical record, and the existence of an anthropic bias. If our universe lies within a false vacuum, a bubble of lower-energy vacuum could come to exist by chance or otherwise in our universe, and catalyze the conversion of our universe to a lower energy state in a volume expanding at nearly the speed of light, destroying all that we know without forewarning. Such an occurrence is called vacuum decay. Popular camping zone love camping bedding set The authors of this study believe the mentioned agricultural crisis will begin to have an effect on the world after 2020, and will become critical after 2050. Geologist Dale Allen Pfeiffer claims that coming decades could see spiraling food prices without relief and massive starvation on a global level such as never experienced before. M. King Hubbert’s prediction of world petroleum production rates. Modern agriculture is heavily dependent on petroleum energy. Grey goo is another catastrophic scenario, which was proposed by Eric Drexler in his 1986 book Engines of Creation and has been a theme in mainstream media and fiction.