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A profile essay is considered to be the most challenging essay to write, but with the correct resources and information, it becomes a walk in the park. Many students confuse this type of essay with the narrative and other essays, but there are distinct characteristics that define each of them. Profile essays require that you get all the correct details of your subject, and to only present ideas that can be supported by a proven fact. The main reason for writing a profile essay is to answer all the questions concerning your subject.
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Analysis: Why scientists think % of global warming is due to humans | Carbon Brief
Today, such an event would almost certainly wreak havoc with modern electronic and satellite technologies. However, the potential environmental impacts of such events are virtually unknown. However, despite compelling evidence from several paleoenvironmental records that suggest it coincided with significant environmental and ecological changes, the ability to precisely characterize this event and determine its role — if any — in contemporaneous global changes has been limited by an uncertain radiocarbon calibration for the period. In this study, Turney, Alan Cooper, and colleagues present a new, precisely dated atmospheric radiocarbon record derived from the tree rings of ancient kauri trees preserved for millennia in New Zealand wetlands. Like a missing keystone, this new record allowed the authors to better align other global radiocarbon and ice core records with the Laschamps.
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Climate change includes both global warming driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. Though there have been previous periods of climatic change , since the midth century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale. Temperature rise on land is about twice the global average increase, leading to desert expansion and more common heat waves and wildfires. These impacts have led the World Health Organization to call climate change the greatest threat to global health in the 21st century.
Throughout the history of the Earth , the planet's climate has been fluctuating between two dominant climate states: the greenhouse Earth and the icehouse Earth. There are five known great glaciations in Earth's climate history; the main factors involved in changes of the paleoclimate are believed to be the concentration of atmospheric carbon dioxide , changes in the Earth's orbit , long-term changes in the solar constant , and oceanic and orogenic changes due to tectonic plate dynamics. Greenhouse and icehouse periods have profoundly shaped the evolution of life on Earth.