Global Warming And Climate Change

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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 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
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Between the start of the Industrial Revolution in 1750, and the year 2005, the increase in the atmospheric concentration of carbon dioxide led to a positive radiative forcing, averaged over the Earth 's surface area, of about 1.66 watts per square metre .
Climate feedbacks can either amplify or dampen the response of the climate to a given forcing.
In the absence of forcings imposed on it, the climate system will still show internal variability . This internal variability is a result of complex interactions between components of the climate system, such as the coupling between the atmosphere and ocean . An example of internal variability is the El Niño-Southern Oscillation.
Detection vs. attribution
Detection and attribution of climate signals, as well as its common-sense meaning, has a more precise definition within the climate change literature, as expressed by the IPCC. Detection of a climate signal does not always imply significant attribution. The IPCC 's Fourth Assessment Report says "it is extremely likely that human activities have exerted a substantial net warming influence on climate since 1750," where "extremely likely" indicates a probability greater than 95%. is absorbed and emitted naturally as part of the carbon cycle, through animal and plant respiration, volcanic eruptions, and ocean-atmosphere exchange.
The high-accuracy measurements of atmospheric CO2 concentration,
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