The many advances during this time had mostly positive effects and the Industrial Revolution transformed government, industry, education and man's overall
When investigating how ice ages begin and end, and feedbacks are considered. A positive feedback will accentuate a dynamic and a negative feedback will mute it. In the 1970s, and the author of today’s , , , which posits that Earth has provided feedbacks that maintain environmental . Under that hypothesis, environmental variables such as atmospheric and levels, levels, and Earth’s surface temperature have been kept relatively constant by a combination of geophysical, geochemical, and life processes, which have maintained Earth’s inhabitability. The homeostatic dynamics were mainly negative feedbacks. If positive feedbacks dominate, then “runaway” conditions happen. In astrophysics, are responsible for a wide range of phenomena. A runaway greenhouse effect may be responsible for . Climate scientists today are concerned that burning the hydrocarbons that fuel the industrial age . Mass extinctions are the result of Earth's becoming largely uninhabitable by the organisms existing during the extinction event. The ecosystems then collapse Mass extinction specialist recently proposed his as a direct challenge to the Gaia hypothesis.
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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.