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Until the 20th century, people had no idea how their activities impacted a portion of their environment that may end up hastening humanity’s demise more than self-made deserts: the atmosphere. Agriculture and civilization meant deforestation, and there is compelling evidence that the Domestication Revolution began altering the composition of Earth’s atmosphere from its earliest days. The natural trend of carbon dioxide decline was reversed beginning about 6000 BCE. Instead of declining from about 260 PPM at 6000 BCE to about 240 PPM today, which would have been the natural trend, it began rising and reached 275 PPM by about 3000 BCE. At the beginning of the Industrial Revolution, atmospheric carbon dioxide concentrations were about 40 PPM higher than the natural trend would suggest. When a forest is razed and the resultant wood is burned, which is usually wood’s ultimate fate in civilizations, it liberated carbon that the tree absorbed from the atmosphere during . , and human activities began measurably adding methane to the atmosphere by about 3000 BCE, which coincided with the rise of the rice paddy system in China. In nature, methane is primarily produced by decaying vegetation in wetlands, both in the tropics and the Arctic, and human activities have increased wetlands even as they made other regions arid. Domestic grazing animals and human digestive systems also contribute to methane production. Atmospheric alteration by human activities has only come to public awareness in my lifetime, but human activities have had a measurable effect on greenhouse gases since the beginnings of civilization, even though the effects were modest compared to what has happened during the Industrial Revolution, as humans burn Earth’s hydrocarbon deposits with abandon.
A mass extinction began when humans left Africa and with ancestors of , but it accelerated when that founder group of behaviorally modern humans . They quickly drove the , as well as the and . Once the inhabitable continents were filled with that founder group’s descendants, , humans independently domesticated plants and animals. The mass extinction continued with the Domestication Revolution, but in less spectacular fashion, usually via habitat destruction. The increasing density of human populations became the primary factor in driving other species to extinction, which were often local extinctions. Ancient and particularly drove north-African megafauna to extinction, but there were few other notable mass extinctions until . When they did, the greatest proportional demographic catastrophes since the extinction of all other human species began. Those same three continents earlier robbed of their megafauna were quickly shorn of their human populations, who were and and in the Americas. In the midst of that unprecedented disaster for , . Although industrialization raised the human standard of living as never before, as the energy of hydrocarbon fuels was exploited on a large scale for the first time, it also enabled greater environmental devastation. Humanity has been turning forests into deserts since the first civilizations (, , , , , , , , , ), and the only reason it has not gotten worse during the industrial era, at least in industrialized, nations, is because hydrocarbons instead of wood were burned. The extinction of the , in the midst of , were indicative of the vast damage that industrialized peoples could inflict on Earth’s ecosystems. Industrialization also accelerated Europe’s conquest of the world. It conquered and subjugated and peoples, reducing them to effective slavery and further devastating the ecosystems.
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Artists have been depicting Carboniferous swamps for more than a century, and the . That represents a key Carboniferous issue and perhaps why the period ended. That , and others like it, appeared in the fossil record about 300 mya, when oxygen levels were Earth’s highest ever, at somewhere between 25% and 35%. The almost universally accepted reason for that high oxygen level is that for the entire Carboniferous Period removed carbon dioxide from the atmosphere in vast amounts. Today, the estimate is that carbon dioxide fell from about 1,500 PPM at the beginning of the Carboniferous to 350 PPM by the end, which is lower than today’s value. That tandem effect of sequestering carbon and freeing oxygen not only may have led to huge arthropods and amphibians, but also intensified . The idea that high oxygen levels led to those giants was first proposed more than a century ago and dismissed, but has recently come back into favor. Flying insects have the highest metabolisms of all animals, but they do not have diaphragmatic lungs as mammals have, or air sac lungs as birds have, and although they may have some way of actively breathing by contracting their tracheas, it is not the bellows action of vertebrate lungs. The for early insect gigantism is that high oxygen, as well as a denser atmosphere (the nitrogen mass would not have fallen, so increased oxygen would have added to the atmosphere’s mass), would have enabled such leviathans to fly, and the other is that flying insects got a head start in the arms race and could grow large until predators that could catch them evolved. The late Permian had an even larger dragonfly, when oxygen levels had crashed back down. The evolution of flight is another area of great controversy, and insects accomplished it long before vertebrates did. The general idea is that flight structures evolved from those used for other purposes. For insects, wings appear to have evolved from aquatic “oars,” and gills became lungs. Reptiles did not develop flight until the Triassic, and .
As with previous critical events, , life helped terraform Earth. But the late Devonian is an instance when the rise of land plants may have also had effects. , which reduced the atmosphere’s carbon dioxide concentration by up to 80%, may have cooled Earth’s surface enough so that an ice age began and another one of Earth’s mass extinctions began. As with the , the ultimate cause for the Devonian extinctions seems to have been rising and falling sea levels, associated with growing and receding ice caps, as . Devonian extinction events began happening more than 380 mya, and a major one happened about 375 mya, called the . The reasons for the Kellwasser event are today generally attributed to the water becoming cold and anoxic.A bolide impact has been invoked in some scientific circles, but .Mountain-building and volcanic events also happened as continents began colliding to eventually form Pangaea (and the resultant silicate and basaltic weathering removed carbon dioxide from the atmosphere), and those dynamics may have been the previous major mass extinction. Black shales abounded during and after the Kellwasser event, and they are always evidence of anoxic conditions and how the oil deposits initially formed. However, the Kellwasser event anoxia may have not only been due to low atmospheric oxygen, but was also the result of eroding the newly exposed land and the detritus of the new forest biomes, which created a vast nutrient runoff into the oceans that may have initiated huge that caused anoxic events near shore.
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Allied forces are assaulting the Reapers above Earth
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