What Motion Changes Take Place During Milankovitch Cycles
Since the Sun is the principal source of the radiant energy the Earth receives from space, it is useful to know if the solar energy flux or solar irradiance, the amount of energy arriving per unit time, varies and if so, then to what degree, in what way, and over what timescales (e.g., are there specific periods or cycles of variation at least over timescales since the rise of human civilization).
He calculated that Ice Ages occur approximately every 41,000 years. Subsequent research confirms that they did occur at 41,000-year intervals between one and three million years ago. But about 800,000 years ago, the cycle of Ice Ages lengthened to 100,000 years, matching Earth’s eccentricity cycle. While various theories have been proposed to explain this transition, scientists do not yet have a clear answer. Milankovitch’s work was supported by other researchers of his time, and he authored numerous publications on his hypothesis. But it wasn’t until about 10 years after his death in 1958 that the global science community began to take serious notice of his theory. In 1976, a study in the journal Science by Hays et al. using deep-sea sediment cores found that Milankovitch cycles correspond with periods of major climate change over the past 450,000 years, with Ice Ages occurring when Earth was undergoing different stages of orbital variation.
Volcanic eruptions emit CO2 when they erupt and hence they are responsible for Global warming though in a very small manner. Moreover, there are other Green House Gases like Methane, which are created naturally and also contribute to the problem of global warming. Onthe other hand, the primary cause of global warming by humans is due to the carbon dioxide released when fossil fuels like oil and coal are burned for energy (ygoy 2012). Wide scale industrialization and technological advancements has contributed massively to the cause of Global warming. All forms of transport, which consume one or the other forms of fossil fuels, are culprits too. Increase in population and Deforestation have increased the CO2 emissions to exaggerate an already serious issue. Chiefly, the close examination on comparison of both natural and human causes of global warming clearly put the main share of blame on human causes. According to study by European scientists, the natural cosmic ray or solar irradiance contribute less than 14% to global warming (Statsburg 2009).
Finally, Earth is currently in an interglacial period (a period of milder climate between Ice Ages). If there were no human influences on climate, scientists say Earth’s current orbital positions within the Milankovitch cycles predict our planet should be cooling, not warming, continuing a long-term cooling trend that began 6,000 years ago.
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