Global warming, what is it really?
“Global warming is an average increase in the temperature of the atmosphere near the Earth’s surface and in the troposphere, which can contribute to changes in global climate patterns. Global warming can occur from a variety of causes, both natural and human induced. In common usage, “global warming” often refers to the warming that can occur as a result of increased emissions of greenhouse gases from human activities.” (visit site)
The Intergovernmental Panel on Climate Change (IPCC) concludes “most of the observed increase in globally averaged temperatures since the mid-twentieth century is very likely due to the observed increase in anthropogenic (man-made) greenhouse gas concentrations”, Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Intergovernmental Panel on Climate Change (2007-02-05).
Also keep in mind the terminology of climate change. The use of “virtual certainty” (or virtually certain) conveys a greater than 99% chance that a result is true. Other terms used to communicate confidence include “extremely likely” (greater than 95% chance the result is true), “very likely” (greater than 90% chance the result is true), “likely” (greater than 66% chance the result is true), “more likely than not” (greater than 50% chance the result is true), “unlikely” (less than 33% chance the result is true), “very unlikely” (less than 10% chance the result is true), and “extremely unlikely” (less than 5% chance the result is true). These judgmental estimates originate from the Intergovernmental Panel on Climate Change (IPCC, 2007). So please keep in mind that when you hear that global warming is “very likely” it really means that it is greater than Read More »