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nature11018
nature11018

... ‘Big Five’ mass extinctions25. The respective critical transitions ended at ,443,000,000, ,359,000,000, ,251,000,000, ,200,000,000 and ,65,000,000 yr ago. They are each thought to have taken at most 2,000,000 yr to complete but could have been much shorter; the limitations of geological dating precl ...
ELA Seventh Grade Common Final Exam
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... Irrespective of the data quality, the simple regression method of Shaviv and Veizer [2003] is unsuitable for estimating the climate sensitivity to a CO doubling.The main reasons are that (i) other forcing and feedback factors may co-vary in a statistically dependent way with CO and cannot be separat ...
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... change projections presented in the next section. Due to weak disaster records, it would be speculative to deduce that a rise in the frequency of climate-related disasters has occurred in the region in recent years, even though this is to be expected as climate change progresses and extreme events b ...
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Paris, for the People and the Planet

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... services, including pollination, carbon and nutrient cycling, and water supply6. Researchers have adopted two main approaches to predict plant responses to climate change. The first approach relies on observations over time or space to quantify sensitivities to temperature variability and change, in ...
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Attribution of recent climate change



Attribution of recent climate change is the effort to scientifically ascertain mechanisms responsible for recent changes observed in the Earth's climate, commonly known as 'global warming'. The effort has focused on changes observed during the period of instrumental temperature record, when records are most reliable; particularly in the last 50 years, when human activity has grown fastest and observations of the troposphere have become available. The dominant mechanisms (to which recent climate change has been attributed) are anthropogenic, i.e., the result of human activity. They are: increasing atmospheric concentrations of greenhouse gases global changes to land surface, such as deforestation increasing atmospheric concentrations of aerosols.There are also natural mechanisms for variation including climate oscillations, changes in solar activity, and volcanic activity.According to the Intergovernmental Panel on Climate Change (IPCC), it is ""extremely likely"" that human influence was the dominant cause of global warming between 1951 and 2010. The IPCC defines ""extremely likely"" as indicating a probability of 95 to 100%, based on an expert assessment of all the available evidence.Multiple lines of evidence support attribution of recent climate change to human activities: A basic physical understanding of the climate system: greenhouse gas concentrations have increased and their warming properties are well-established. Historical estimates of past climate changes suggest that the recent changes in global surface temperature are unusual. Computer-based climate models are unable to replicate the observed warming unless human greenhouse gas emissions are included. Natural forces alone (such as solar and volcanic activity) cannot explain the observed warming.The IPCC's attribution of recent global warming to human activities is a view shared by most scientists, and is also supported by 196 other scientific organizations worldwide (see also: scientific opinion on climate change).
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