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For the period of Classical antiquity to the Middle Ages, roughly 500 BC to AD 1500, there was also a general tendency of growth (estimated at a factor 4 to 5 over the 2,000-year period), but not strictly monotonic: A noticeable dip in world population is assumed due to the Black Death in the mid-14th century.
About 34 million years ago, the time of the Eocene–Oligocene extinction event and when the Antarctic ice sheet started to take its current form, CO 2 was about 760 ppm, [132] and there is geochemical evidence that concentrations were less than 300 ppm by about 20 million years ago.
Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease to have been eradicated to date.
The ice age was possibly not long-lasting. Oxygen isotopes in fossil brachiopods show its duration may have been only 0.5 to 1.5 million years. [95] Other researchers (Page et al.) estimate more temperate conditions did not return until the late Silurian.
On June 20, 2023, Roblox started allowing games rated as only for players 17 years and over, which are permitted to have more graphic violence, romantic themes, and alcohol usage. [85] On July 27, 2023, Roblox was released as a public beta for the Meta Quest 2 and Meta Quest Pro. [8] The beta was downloaded over one million times within five ...
In sharp contrast, the period between 14,300 and 11,100 years ago, which includes the Younger Dryas interval, was an interval of reduced sea level rise at about 6.0–9.9 mm/yr. Meltwater pulse 1C was centered at 8,000 years ago and produced a rise of 6.5 m in less than 140 years, such that sea levels 5000 years ago were around 3m lower than ...
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