What is global warming?

Posted on octubre 23rd, 2011 in First Paper by andogo


Global warming refers to the rising average temperature of Earth’s atmosphere and oceans and its related effects. In the last 100 years, Earth’s average surface temperature increased by about0.8 °C (1.4 °F) with about two thirds of the increase occurring over just the last three decades. Warming of the climate system is unequivocal, and scientists are more than 90% certain most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and burning fossil fuel. (http://en.wikipedia.org/wiki/Global_warmingDefinition 1

Glaciers are melting, sea levels are rising, cloud forests are drying, and wildlife is scrambling to keep pace. It’s becoming clear that humans have caused most of the past century’s warming by releasing heat-trapping gases as we power our modern lives. Called greenhouse gases, their levels are higher now than in the last 650,000 years.

We call the result global warming, but it is causing a set of changes to the Earth’s climate, or long-term weather patterns, that varies from place to place. As the Earth spins each day, the new heat swirls with it, picking up moisture over the oceans, rising here, settling there. It’s changing the rhythms of climate that all living things have come to rely upon. (http://environment.nationalgeographic.com/environment/global-warming/gw-overview/Definition 2

Global warming is closely linked to the enhanced greenhouse effectwhich is an increase in the concentration of greenhouse gases in the atmosphere leading to an increase in the amount of infrared or thermal radiation near the surface. Most scientists agree that the enhanced greenhouse effect is leading to rising temperatures, referred to as global warming, and other changes in the atmospheric environment, known as climate change (a term that in common usage also includes natural changes).(http://www.global-greenhouse-warming.com/definition-for-global-warming.html)Definition 3

It refers to the observed and projected increase in the earth’s average temperature due to natural or anthropogenic climate change. The earth’s average temperature rose about 0.7° Celsius (1.3° Fahrenheit) in the 20th century.  Gases created through human industrial and agricultural practices (primarily carbon dioxide from burning fossil fuels and wood, as well as methane, nitrous oxide, and chlorofluorocarbons) increase the heat-reflecting potential of the atmosphere, thereby raising the planet’s average temperature.

(http://www.benefits-of-recycling.com/definitionforglobalwarming.htmlDefinition 4

Video Global Warming Presentation




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