Introduction For Global Warming Thesis

Introduction For Global Warming Thesis-42
For other uses see Global warming (disambiguation).

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increased concentrations of greenhouse gases), solar luminosity, volcanic eruptions, and variations in the Earth's orbit around the Sun.

Attributing detected temperature changes and extreme events to human-caused increases in greenhouse gases requires scientists to rule out known internal climate variability and natural external forcings.

Therefore, a key approach is to use physically or statistically based computer modelling of the climate system to determine unique fingerprints for all potential causes.

By comparing these fingerprints with observed patterns and evolution of climate change, and the observed evolution of the forcings, the causes of the observed changes can be determined.

The black line is the global annual mean, and the red line is the five-year local regression line. Global warming is the long-term rise in the average temperature of the Earth's climate system.

It is a major aspect of current climate change, and has been demonstrated by direct temperature measurements and by measurements of various effects of the warming.

Every country in the world is a party to the United Nations Framework Convention on Climate Change (UNFCCC), Annual temperature anomalies (thin lines) and five-year lowess smooths (thick lines) for average temperatures over the Earth's land area (red line) and sea surface over the part of the ocean that is free of ice at all times (blue line)Two millennia of mean surface temperatures according to different reconstructions from climate proxies, each smoothed on a 15 year time scale, with the instrumental temperature record starting in 1858 in black.

Historical patterns of warming and cooling, like the Medieval Climate Anomaly and the Little Ice Age, were not as synchronous as current warming, but may have reached temperatures as high as those of the late-20th century in a limited set of regions.

Because the climate system has a large "inertia" and greenhouse gases persist in the atmosphere, climatic changes and their effects will continue for many centuries even if greenhouse gas emissions are stopped.

Possible societal responses to global warming include mitigation by emissions reduction, adaptation to its effects, and maybe climate engineering.

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